4. Human Physiology CV System Anatomy

Which is NOT an anatomical structures of the CV system?

• Blood

• Blood vessels

• periosteum

• Heart

Which blood vessels carry blood to or from the lungs?

• superior vena cava

• aorta

• pulmonary artery

• pulmonary vein

When the heart is in systolic phase it is contracting, true or false?

• true

• false

Which of the following is the inner layer of the heart?

• Visceral Pericardium

• Myocardium

• Endocardium

• Parietal Pericardium

The heart is constructed of one long thin layer of muscle wrapped in a figure of eight.

True or False?

• True

• False

Which section of the blood vessel contains the smooth muscle?

• Adventitia

• Tunic Externia

• Tunic Media

• Tunic Intima

How many cells thick are capillaries?

• 1

• 2

• 3

• 4

How do veins aid venous return to the heart?

• non return valves

• narrow lumen

• thick tunic media

• muscles squeeze blood back towards the heart

How are erythrocytes designed to carry O2?

• high heamoglobin content

• Anuclear

• Move in ameboid fashion

• biconcave disk

Approximately what is the hematocrit in humans?

• 30-35%

• 35-40%

• 40-45%

• 45-50%