1 Pulse pressure is increased by A an increase in diastolic

1. Pulse pressure is increased by: A. an increase in diastolic pressure B. an increase in systolic pressure C. an equivalent increase in both systolic and diastolic pressure D. a decrease in systolic pressure

2. Fenestrated capillaries occur in the: A. liver B. kidney C. cerebrum D. intestinal mucosa

3. Vessels that do not have all three tunics include: A smallest arterioles B. smallest venules C. capillaries D. venous sinuses

4. Venous return to the right atrium is increased by: A increasing the depth of respiration B. vigorous walking C. an increase in ventricular contraction strength D. activation of angiotensin II

Solution

1. Pulse pressure is increased by the increase in the systolic pressure , hence option B is correct, because either systemic or pulmonary pulse pressure psystolic - p diastolic gives pulse pressure

2)B kidneys, fenestrated capillaries are open pores in the kidney cells which assists the rapid filtration of blood plasma ,this allow larger molecules , these are more permeable than continuous capillaries, seen in kidneys, endocrine glands, small intestine villi, not mucosa.

3)D venous sinuses are not included in the tunics, these are tunics externa, media and interna these are arterioles,venules and capillaries.

4) B

right atrial pressure also alters venous returns hence option B vigorous walking increase venous return to right atrium other factors like gravity,venacava compression, during inspiration decreased venous capacitance and running, walking, swimming etc increases the Venous returns