A&P Lab Quiz Chpt. 19

Describe the respiratory pump. (Module 19.12A)

The respiratory pump is a mechanism by which a reduction of pressure in the thoracic cavity during inhalation assists venous return to the heart.

Describe the roles of the natriuretic peptides. (Module 19.10C)

The roles of these peptides are to trigger responses whose combined effects are to decrease blood volume and decrease blood pressure.

What effect does an increase in the respiratory rate have on CO2 levels? (Module 19.11C)

decreases CO2 levels

Each of the following changes will result in increased blood flow to a tissue except a. increased blood pressure b. relaxation of precapillary sphincters c. increased vessel diameter d. decreased peripheral resistance e.increased hematocrit.

e. increased hematocrit

Identify the veins that combine to form the brachiocephalic vein. (Module 19.18C)

external jugular, internal jugular, vertebral, and subclavian veins

Homeostatic mechanisms in response to blood loss include all of the following except

inhibition of EPO secretion.

A blockage of which branch of the aortic arch would interfere with blood flow to the left arm?

left subclavian artery

Blood pressure increases with all of the following except increased

parasympathetic innervation.

Grace is in an automobile accident, and her celiac trunk is ruptured. Which organs will be affected most directly by this injury? (Module 19.20C)

stomach, inferior portion of the esophagus, spleen, liver, gallbladder, and proximal portion of the small intestine.

At the level of the first rib, the axillary vein becomes the ________ vein.

subclavian

Name the two large veins that collect blood from the systemic circuit. (Module 19.16B)

superior vena cava and inferior vena cava

1. pulmonary venules2. pulmonary trunk3. pulmonary veins4. alveolar capillaries5. pulmonary arterioles 6. pulmonary arteries

2, 6, 5, 4, 1, 3

________ is the regulation of blood flow by local mechanisms within a capillary bed.

Autoregulation

Under what general conditions would fluid move into a capillary? (Module 19.8A)

When blood colloid osmotic pressure is greater than capillary hydrostatic pressure.

What factors are involved in the formation of varicose veins? a. Varicose veins form when the vein walls weaken and the valves fail so blood begins to pool in the veins. b. Varicose veins form when blood pressure is too high damaging the valves.Varicose veins form when blood pressure is too low so the valves do not open. c.Varicose veins form when the valves become stiff and fail to open. dVaricose veins form when sympathetic activation causes venoconstriction.

a.