Question

1. The aortic valve of the mammalian heart ________.

1. is the route by which blood flows from the atria to the ventricles
2. is found on the right side of the heart
3. is the attachment site where the pulmonary veins empty into the heart
4. prevents backflow of blood in the aorta
5. is located where the anterior and posterior venae cavae empty into the heart

2. What type of blood vessels has the slowest velocity of blood flow?

1. arteries
2. arterioles
3. veins
4. capillaries

1. The pacemaker cells are found in what structure?

1. sinoatrial node
2. the ventricles
3. left atrium
4. aorta

1. Blockage of vessels supplying blood to the heart itself is ________.

1. called arteriosclerosis
2. caused by hardening of the arteries
3. called myocardial infarction or a heart attack
4. prevented by the use of nicotine

Answer 1

1:the route by which blood flows from the artria to the ventricles

2:capillaries

3:pace maker is also called sinoatrial node located at walls of the right atrium

4:called myocardial infarction or a heart attack