circulation worksheet 2

1.Fill in the blanks:

A. median cubital____vein is used to take blood samples in elbow.

B. superior vena cava_drains blood from head, neck, thorax and upper limbs into heart.

C. Whereas inferior vena cava___drains blood from abdomen, pelvis and lower limbs into heart.

D. Portal vein is formed by union of__splenic vein__and___superior mesenteric vein__.

2.Match the vein with the area of drainage:

3. Define Blood pressure. What do systolic and diastolic blood pressure represent?

blood pressure is the measure of force blood exerts against blood vessel walls. systolic blood pressure is the contraction of the heart and diastolic blood pressure is the relaxation of the heart.

4. What is pulse pressure? Calculate pulse pressure if systolic is 130 mm Hg and diastolic is 80 mm Hg.

pulse pressure is the difference between systolic and diastolic blood pressure. is systolic is 130 and diastolic is 80, the pulse pressure would be 50mm Hg.

5.Control of blood pressure:

A. The vasomotor center for nervous control of blood pressure lies in pons_and_medulla oblongata__.

B. The hormonal control of blood pressure is by hormones epinephrine and norepinephrine secreted by adrenal medulla.

C. baroreceptorsrespond to stretch in arteries due to increased pressure. These are located in carotid sinuses__ and__aortic arch_________________.

D. chemoreceptorsare sensitive to changes in blood oxygen, carbondioxide and pH. These are located in_carotid bodies_ and aortic bodies_________________ .

E. The hormone, renin___________ is secreted by kidney maintains blood pressure in long term.

F. The hormone, antidiuretic__ is released by hypothalamus when blood pressure is decreased.

6.Fill in the blanks:

A. mean arterial pressure (MAP)_is a calculated value that reflects an average arterial pressure in various vessels of the body.

B. It is the product of cardiac output___and___systemic vascular resistance__.

C. It is maintained at about 95 mm Hg_ from adolescence to middle age.