Unlock hundreds more features
Save your Quiz to the Dashboard
View and Export Results
Use AI to Create Quizzes and Analyse Results

OR
Sign inSign in with Facebook
Sign inSign in with Google
Quizzes > Health & Medicine

Organs of the Body Quiz: Grade 4 Body Systems

Quick, kid-friendly human body system quiz. Instant results.

Editorial: Review CompletedCreated By: Victor RodriguezUpdated Aug 26, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art human body with cutout organs on golden yellow background for Grade 4 body systems quiz.

This organs of the body quiz helps fourth graders identify key organs and match each one to its body system. Practice questions cover the circulatory, respiratory, digestive, and nervous systems, with quick feedback to show what to review next. For more practice, see our human body system quiz and body systems test, or focus on the belly with this abdominal organs quiz.

Which system is responsible for pumping blood throughout the body?
Digestive system
Respiratory system
Circulatory system
Skeletal system
The circulatory system, also called the cardiovascular system, is responsible for moving blood through the heart, arteries, veins, and capillaries to deliver oxygen and nutrients to cells and remove waste products. The heart acts as the pump that keeps this blood flowing. Maintaining healthy blood circulation is vital for all body functions.
Which organ helps us breathe in oxygen?
Stomach
Lungs
Heart
Kidney
The lungs are the primary organs of the respiratory system and bring oxygen into the body while removing carbon dioxide. Tiny air sacs called alveoli in the lungs allow gas exchange with the blood. Healthy lung function is essential for supplying oxygen to all cells.
What is the hardest bone in the human body?
Tibia
Jawbone (mandible)
Femur
Skull
The mandible, or lower jawbone, is the strongest and hardest bone in the human body because it withstands the forces of chewing and biting. It holds the lower teeth in place and moves against the upper jaw. Its strength supports essential functions like eating and speaking.
Which body system protects against germs and helps regulate temperature?
Digestive system
Nervous system
Integumentary system (skin)
Endocrine system
The integumentary system includes the skin, hair, and nails. It acts as a barrier against pathogens, helps regulate body temperature through sweating, and prevents dehydration. Healthy skin is the first line of defense against infections.
What do muscles do?
Pump blood
Help us move
Digest food
Send signals
Muscles contract and relax to produce movement of bones and joints, enabling us to walk, run, and perform daily activities. They also help maintain posture and generate heat. There are three types of muscles: skeletal, smooth, and cardiac.
What is the main function of the stomach?
Filtering blood
Digestion
Pumping blood
Gas exchange
The stomach is a muscular organ in the digestive system that mixes and breaks down food using digestive acids and enzymes. It turns food into a semi-liquid mixture called chyme before releasing it into the small intestine. Proper stomach function is key to nutrient absorption.
Where is the brain located?
In the pelvis
In the chest
In the abdomen
In the head
The brain is housed within the skull in the head. It serves as the control center for the entire body, processing information from the senses, controlling movement, and regulating bodily functions. Protecting the brain with the skull and cerebrospinal fluid is vital.
What do red blood cells carry?
Oxygen
Waste
Food
Nerves
Red blood cells contain hemoglobin, a protein that binds to oxygen in the lungs and carries it to tissues throughout the body. They then return carbon dioxide to the lungs for exhalation. Red blood cells are essential for delivering oxygen where it's needed.
Which system includes the kidneys and helps remove waste from the blood?
Digestive system
Nervous system
Circulatory system
Excretory (urinary) system
The excretory or urinary system filters blood through the kidneys to remove waste and excess water in the form of urine. The filtered blood returns to circulation, keeping chemical levels balanced. This system helps maintain homeostasis.
What is the name of the largest artery in the human body?
Vena cava
Pulmonary artery
Aorta
Carotid artery
The aorta is the main artery that carries oxygen-rich blood away from the heart to supply all parts of the body. It branches into smaller arteries that reach organs and tissues. Its large size and thick walls handle high-pressure blood flow.
Which part of the digestive system absorbs nutrients?
Small intestine
Large intestine
Esophagus
Stomach
The small intestine has villi and microvilli that increase its surface area to absorb nutrients from digested food into the bloodstream. It works with enzymes from the pancreas and bile from the liver for efficient digestion. The large intestine mainly absorbs water.
Which muscle helps you breathe by moving up and down?
Diaphragm
Hamstring
Biceps
Heart
The diaphragm is a dome-shaped muscle located below the lungs. When it contracts, it flattens and creates a vacuum that draws air into the lungs. When it relaxes, air is pushed out. It's the main muscle of respiration.
Which system controls body activities with hormones?
Endocrine system
Nervous system
Respiratory system
Circulatory system
The endocrine system consists of glands that secrete hormones into the bloodstream to regulate processes like growth, metabolism, and reproduction. Hormones act as chemical messengers to maintain homeostasis. It works closely with the nervous system.
What is the function of the alveoli in the lungs?
Pump blood
Filter waste
Gas exchange
Remove toxins
Alveoli are tiny air sacs at the end of bronchioles where oxygen diffuses into the blood and carbon dioxide diffuses out of the blood into the lungs. Their large combined surface area and thin walls make gas exchange efficient.
Which organ produces bile to help digest fats?
Liver
Pancreas
Stomach
Gallbladder
The liver produces bile, a digestive fluid that helps break down fats into smaller droplets for easier digestion. Bile is stored and concentrated in the gallbladder before being released into the small intestine.
What is the main function of white blood cells?
Carry oxygen
Digest food
Transmit signals
Fight infection
White blood cells (leukocytes) are part of the immune system and help defend the body against bacteria, viruses, and other pathogens. They identify, attack, and remove foreign invaders and damaged cells. A healthy immune response relies on white blood cells.
Which two bones protect the heart and lungs?
Pelvis and spine
Skull and mandible
Rib cage
Femur and tibia
The rib cage is formed by ribs and the sternum, which encase and protect vital organs such as the heart and lungs. It also supports breathing by changing volume as muscles contract. Without the ribs, these organs would be vulnerable to injury.
What type of joint allows the most movement?
Fixed joint
Pivot joint
Hinge joint
Ball and socket joint
Ball and socket joints, such as the shoulder and hip joints, allow movement in almost all directions, including rotation. This range of motion makes them the most flexible type of joint. Other joints have more limited movement like bending or rotating.
Which structure connects muscles to bones?
Tendons
Cartilage
Neurons
Ligaments
Tendons are strong, fibrous connective tissues that attach muscle to bone, allowing the force of muscle contraction to move the skeleton. Ligaments, by contrast, connect bone to bone. Proper tendon health is important for movement and stability.
What is the name of the structure that carries urine from the kidney to the bladder?
Renal artery
Urethra
Nephron
Ureter
Ureters are tubes that transport urine from each kidney down to the bladder for storage. The urethra is then the tube that carries urine out of the bladder during urination. Nephrons are the filtering units inside the kidney.
Which part of the brain controls balance and coordination?
Cerebellum
Brainstem
Cerebrum
Hypothalamus
The cerebellum is located at the back of the brain beneath the cerebrum and is responsible for coordinating voluntary movements, balance, posture, and motor learning. It ensures smooth, precise muscle activity. Damage to the cerebellum can cause coordination issues.
What is peristalsis?
Pumping of blood by the heart
Filtering of waste by kidneys
Muscle contractions that move food through the digestive tract
Movement of air in and out of lungs
Peristalsis refers to the rhythmic, wave-like muscle contractions that push food through the esophagus, stomach, and intestines during digestion. This involuntary process helps mix food with digestive juices and move it along the tract.
How does the structure of alveoli support their function?
Large surface area and thin walls
Thick walls and small surface area
Rigid structure and hard walls
Multiple layers and cilia
Alveoli are tiny sacs with extremely thin walls (one cell thick) and a large combined surface area, which allows oxygen and carbon dioxide to diffuse quickly between air and blood. Their design maximizes gas exchange efficiency in the lungs.
Which hormone regulates blood sugar levels?
Thyroxine
Insulin
Melatonin
Adrenaline
Insulin is produced by the beta cells of the pancreas and helps lower blood glucose levels by facilitating cellular uptake of sugar. It works alongside glucagon to maintain balanced blood sugar. Dysfunction in insulin production can lead to diabetes.
How do nerves transmit signals to muscles?
By filtering signals
Through chemical digestion
By pumping blood
Through electrical impulses and neurotransmitters
Nerves send electrical impulses along axons to the neuromuscular junction, where neurotransmitters cross the synaptic gap to trigger muscle fiber contraction. This electrical-chemical process allows fast, precise control of movement.
0
{"name":"Which system is responsible for pumping blood throughout the body?", "url":"https://www.quiz-maker.com/QPREVIEW","txt":"Which system is responsible for pumping blood throughout the body?, Which organ helps us breathe in oxygen?, What is the hardest bone in the human body?","img":"https://www.quiz-maker.com/3012/images/ogquiz.png"}

Study Outcomes

  1. Understand Major Body Systems -

    Learn to recognize and describe the primary human body systems covered in the Grade 4 anatomy quiz, including the circulatory, respiratory, digestive, and nervous systems.

  2. Identify Key Organs -

    Be able to pinpoint and name essential organs such as the heart, lungs, stomach, and brain as you progress through the kids human body quiz.

  3. Explain Organ Functions -

    Gain the ability to explain how each organ works within its system to keep the body healthy and functioning properly.

  4. Differentiate Between Systems -

    Distinguish the roles and interactions of different body parts and organs by comparing and contrasting their functions.

  5. Apply Knowledge in Quiz Challenges -

    Use your understanding to answer questions accurately in the elementary body systems test and improve your anatomy recall.

  6. Boost Confidence in Anatomy -

    Develop greater confidence in your anatomical knowledge and prepare for more advanced science topics through this grade 4 anatomy quiz experience.

Cheat Sheet

  1. Overview of Major Body Systems -

    The human body is organized into major systems like skeletal, circulatory, digestive, and nervous, each working together to keep you healthy. Reviewing how these systems interact is key to acing a human body systems quiz or elementary body systems test (Source: NIH). This big-picture approach sets you up for success on any grade 4 anatomy quiz!

  2. Skeletal System Basics -

    Your skeleton gives your body shape, protects organs, and helps you move (Source: KidsHealth.org). Remember the mnemonic SOAP - Support, Organ protection, Assist movement, and Production of blood cells - to recall the five main functions. Knowing major bones like the femur and skull will boost your score on a body parts and organs quiz.

  3. Circulatory System Essentials -

    The heart, blood, and vessels make up the circulatory system, delivering oxygen and nutrients everywhere (Source: American Heart Association). Use the phrase "ABO" to remember blood types - A, B, and O - and their compatibility rules. Understanding how your heart beats (about 70 beats per minute) can help on any kids human body quiz question about blood flow.

  4. Digestive System Pathway -

    Food travels from Mouth to Esophagus to Stomach, then through the Small and Large Intestines (Source: Khan Academy). Try the fun phrase "My Eager Sister Sings Loudly" to remember Mouth, Esophagus, Stomach, Small intestine, Large intestine. Knowing this order helps you sail through digestive questions on a grade 4 anatomy quiz.

  5. Nervous System Connections -

    Your brain, spinal cord, and nerves form the nervous system, sending electrical signals to control everything (Source: CDC). A quick trick: "NEBS" stands for Nerves, Electrical signals, Brain, Spinal cord to lock in the main parts. Mastering this gives you confidence in any elementary body systems test question on how we sense and react.

Make a Quiz (FREE) Copy & Edit This Quiz Create a Quiz with AI

Human Anatomy & Medicine Quizzes

Powered by: Quiz Maker