Biology - The Heart

Which of the following layers of the heart is this a description of "This layer is comprised of cardiac muscle tissue, makes up the majority of the cardiac wall and is responsible for its pumping action. The thickness of this layer mirrors the load to which each specific region of the heart is subjected"

What are the blood vessels that correctly complete the following statement: Blood enters the heart through two large veins, the ? And the ?, emptying oxygen depleted blood from the body into the right atrium.

The following statement is the first stage of what type of blood flow through the heart: The pulmonary veins empty oxygen-rich blood from the lungs into the left atrium.

What type of blood vessel is this a description of? Their thin walls allow [oxygen, nutrients], carbon dioxide, and other waste products to pass to and from cells.

What type of blood vessel is this a description of: They carry oxygen-rich blood away from] the heart to all of the body's tissues.