Which of the following leukocytes are correctly matched with

Which of the following leukocytes are correctly matched with their function:

A. lymphocytes-regulate the volume and composition of lymph

B. basophil-plays a primary role in the immune response by secreting antibodies

C. neutrophil-phagocytic cell arriving first at the scene of the inflammatory response

D. esosinophil-possessing the capability to extravasate and develop into a macrophage within the tissues

E. none of the above

If, stroke volume were to decrease:

A. end systolic volume would increase

B. ejection fraction would decrease

C. cardiac output would decrease

D. all

QUESTION 17

According to the Frank-Starling law of the heart:

A. At lower end diastolic volumes, stroke volume will increase due to more overlap of actin and myosin and more forceful contractions

B. If end diastolic volume increases, stroke volume will increase proportionately due to optimal overlap of actin and myosin

C. The shorter the initial length of the cardiac muscle fibers prior to contraction the more forceful will be the subsequent contraction

D. As cardiac output is reduced, blood pools in the veins so that arterial blood pressure increases and venous return increases

Which of the following is a function of Angiotensin II:

A. acts as a potent vasodilator via smooth muscle inhibition

B. increases urine output via vasopressin activity

C. increases sodium content in the urine

D. stimulates the secretion of renin from the juxtaglomerular apparatus

E. none of the above

Solution

Answer:

(15) C

The first cells which arrive at the site of injury are the neutrophils. They immediately respond to inflammation and kill bacteria by phagocytosis.

(16) D

If systolic volume were to decrease, it would result in an increase in end systolic volume and a decrease in ejection fraction and cardiac output.

(17) B

If end diastolic volume increases, stroke volume will increase proportionately due to suitable overlap of actin and myosin.

(18) D

Angiotensin II stimulates the secretion of renin from the juxtaglomerular apparatus.