Lectures 9+10
Heart Excitability and Function Quiz
Test your knowledge on the excitability and fun
- Multiple choice questions.
- Covering heart physiology and nervous system interactions.
- Perfect for students and enthusiasts alike.
Which one is correct about the excitability of the heart ?
The slow calcium - sodium will be opening after the A.P
Two answers are correct
After the A.P occur fast sodium channel open and the sodium enter the cell
When the A.P occur slow calcium- sodium channel will be open
Which on of those responsible for continuing initiation of A.P
Slow calcium - sodium channel
Sodium - potassium pump
Fast sodium channel
All answers are correct
A single cell mass containing several nuceli formed by fusion of cells
Syncytium
Excitability
Contractility
Onducting
Atriums are contracting as one unit
True
False
Ventricles contract as one unit
True
False
Important structure that found in smooth muscle but never in skeletal
Gap junction
Intercalated discs
Nucles
Soduim ions
Which statement of the heart is correct
It is located in the mediastnium in the thoracic cavity
It is composed of 4 chambers
Two answers are correct
Normally you can found the apical pulse in the 6th and 7th intercostal space
Which one of the statement is true about the sound of heart
(lub) is created with the closing of the semilunar valve
(dub) is created with the closing of the atrioventrical valves
Two answers are correct
S3 sound is normal for the people who is under 40 years old ,but is generally pathologic over the age of 40
All answers are correct
What is true about the enteric nervous system
It is in the GIS
It control the GIS
Still under the influence of parasympathetic and sympathetic
All answers are correct
In parasympathetic the preganglionic is shorter than SNS
True
False
Choose the right statement
One of them have the opposite effect related to the other one
Usually both system are not active
All of the above
None of the above
Mechanisms of Excitation of the Heart by the Sympathetic Nerves
Increase the heart rate
Decreases the force of heart contraction
Decreasing the volume of blood pumped and increasing the ejection pressure
All of the above
Mechanisms of Excitation of the Heart by the Sympathetic Nerves If inhibition of the sympathetic stimulation
Increases the force of heart
Decrease cardiac pumping to a moderate extent
Increasing the volume of blood pumped and increasing the ejection pressure
None of the above
The SNS effect the medulla in the adrenal gland
True
False
The effect of venoconstriction
The veins are preserve of blood so that veins stimulated by SNS more than other vessels.
It increase the venous return ( increase the rate of the blood back to the heart
it increase the cardiac output
All answers are correct
Parasympathetic cranial nerves
4,5,7
2,3,4
3,7,9,10
3,5,7,9
What is true about the innervation of the heart
10 cranial nerve response of innervation of the heart(atriums
The parts of heart which innervated by PSNS only atriums (SA and AV nodes)
Parasympathetic dominance (Rest-and-digest) in quiet, relaxed situations
All answers are correct
The AV node is the pace maker of the heart
True
False
Binds with a neurotransmitter’s receptor and blocks the neurotransmitter’s response
Agonist
Antagonist
Atropine
Salbutamol
Atropine
Binds with a neurotransmitter’s receptor and blocks the neurotransmitter’s response
Blocks the effect of acetylcholine at muscarinic receptors but does not affect nicotinic receptors
Selectively activates β 2 adrenergic receptors at low doses
Binds with a neurotransmitter’s receptor and elicits an effect that mimics that of the neurotransmitter
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