Pulmonary Blood Flow and Circulatory System

These flashcards cover key concepts regarding the pulmonary blood flow and circulatory system, including functions of blood components, properties of the heart, and vascular resistance.

The circulatory system consists of blood, heart, and __.

vascular system.

Average total blood volume for males is __ liters.

5 to 6 L.

The primary function of erythrocytes is to transport __ from lungs to tissues.

O2.

Normal range of red blood cells in males is __ per mm³.

5.8 million.

The average lifespan of red blood cells is about __ days.

120.

Leukocytes protect the body against __ microorganisms.

invading.

If the WBC count is increased, it is termed __.

leukocytosis.

Platelets play an important role in preventing __.

blood loss.

The heart acts as __ separate pumps for oxygenated and unoxygenated blood.

two.

The structure that encloses the heart is called __.

pericardium.

Blood leaves the right ventricle through the __.

pulmonary trunk.

During ventricular contraction, the pressure in arteries is known as __ pressure.

systolic.

Pulmonary circulation has a mean pressure of __ mmHg.

15.

Cardiac output is calculated as the product of stroke volume and __.

heart rate.

When PVR increases, blood pressure __.

increases.

Hypoxic vasoconstriction directs blood away from hypoxic lung areas to areas of __ O2 pressure.

higher.

Vasoconstriction can occur in response to agents like __ and norepinephrine.

epinephrine.

Passive factors affecting vascular resistance include changes in pulmonary arterial pressure and lung __.

volume.

As pulmonary artery pressures increase, PVR __ due to increased intralumenal pressures.

decreases.