Circulation

Question 1

Name three tissues that make up arteries.

Answer 1

Elastic tissue
Collagen
Smooth muscle

Question 2

What is the intima of the artery composed of?

Answer 2

Inner surface lining of endothelial cells

Question 3

What is the adventitia of the artery composed of?

Answer 3

Collagen connective tissue

Question 4

How many elastic laminae are found in the artery?

Answer 4

Two

Question 5

Name the tissues that make up veins.

Answer 5

Collagen
Little smooth muscle
Little elastic tissue

Question 6

How many elastic laminae are found in the vein?

Answer 6

One internal

Question 7

What is the function of valves in veins?

Answer 7

Prevents back flow of blood

Question 8

Why are veins surrounded by skeletal muscle?

Answer 8

Skeletal muscle contracts to allow blood in the veins to flow back to the heart

Question 9

Describe the structure of endothelium cells.

Answer 9

Little cytoplasm
Single layer of pavement cells
Prominent adheren junctions
Can be fenestrated

Question 10

What are capillaries?

Answer 10

Tubes of endothelial cells (one cell thick) bound to a basement membrane.

Question 11

Describe the steps of pulmonary circulation.

Answer 11

1. Deoxygenated blood leaves right ventricle via pulmonary trunk
2. Pulmonary trunk branches into two pulmonary arteries for each lung
3. Blood becomes oxygenated and leaves the lungs via the four pulmonary veins
4. Blood enters into the left atrium, then left ventricle to be pumped through the aorta and to the body

Question 12

Describe the steps of systemic circulation.

Answer 12

1. Oxygenated blood leaves the left ventricle via the aorta
2. Arteries branch off the aorta and divide into arterioles and then capillaries
3. Deoxygenated blood enters the venules which unite to form veins
4. The veins drain into the inferior and superior vena cava and blood enters the right atrium

Question 13

Which artery supplies the SAN?

Answer 13

60% of people: right coronary artery

40% of people: right circumflex artery