BIO 238

Sample Questions

The Circulation

1. Which of the following join to produce the hepatic portal vein:

            (A) splenic vein and superior mesenteric vein,   (B) splenic vein and inferior mesenteric vein,

            (C) splenic vein and hepatic vein,   (D) hepatic vein and hepatic artery.

2. Vasoconstriction in the _____ is most important in regulating blood pressure and distribution:

            (A) elastic arteries,   (B) muscular arteries,   (C) arterioles,   (D) all of these,   (E) B and C only.           

3. The _____ could NOT be part of a sequence taking blood from the aorta to the brain:

            (A) common carotid artery,   (B) subclavian artery,   (C) vertebral artery,   (D) external carotid artery.              

4. The lowest fluid pressure is found in the:

            (A) large systemic veins,   (B) fenestrated capillaries,   (C) lymph capillaries ,   (D) lymph veins.

5. The muscular pump is important for fluid movement in the:

            (A) large systemic veins,   (B) fenestrated capillaries,   (C) lymph capillaries ,   (D) lymph veins,  

            (E) A and D only.

6. Chambers with discontinuous walls which allow unlimited transport and mixing are known as:

            (A) fenestrated capillaries,   (B) sinusoids,   (C) continuous capillaries,   (D) sinuses.

7. Which of the following is an interarterial anastomosis:

(A) the circumflex and right coronary arteries,   (B) the anterior interventricular and posterior interventricular arteries,   (C) the Circle of Willis,   (D) the ductus venosus,    (E) all of these,    (F) all except D.

8. A _____ can route blood away from a particular capillary bed and back to the venous system.

            (A) metarteriole,   (B) arteriovenous anastomosis,   (C) interarterial anastomosis,   (D) sinusoid,

            (E) A and B only.

9. The greatest cross-sectional area of any vascular component (all vessels of that type considered together)

            is found in the:

            (A) arteries,   (B) veins,   (C) capillaries,   (D) blood sinuses.

10. As cross-sectional area of a vascular component increases, the velocity of blood flow:

            (A) increases,   (B) decreases,   (C) remains unchanged.

11. When the body is exposed to cold temperatures blood is rerouted away from the skin to the core of the body.

       This is a function of:                  (A) the vasomotor center,   (B) autoregulation.

12. Maintaining constant blood flow to the brain despite an overall increase in blood pressure is a function of:

            (A) the vasomotor center,   (B) autoregulation.

13, 14. When CO₂ in blood vessels of active skeletal muscles increases due to exertion, blood vessels leading to those muscles will ___(13)_____ as a function of ___(14)___.

            (A) vasodilate,   (B) vasoconstrict,   (C) the vasomotor center,   (D) autoregulation

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15 through 19: Matching. Match the structure with its description below.

            (A) ductus venosus,   (B) ligamentum arteriosum,   (C) foramen ovale,   (D) Circle of Willis,  

            (E) coronary sinus.

15. This eventually produces a portion of the ligament which supports the liver.

16. This enters the right atrium.

17. When functional, this structure carries blood from the pulmonary artery directly to the aorta.

18. This is the first of two fetal bypasses of the pulmonary division.

19. This structure supplies the cerebral arteries with blood.