Test: MCAT Biology

2.

Which of the following statements about capillaries is FALSE?

I.  The blood flow to a capillary bed can be interrupted by constriction of pre-capillary sphincters.

II.  There is a continuous, slow exudation of intravascular fluid into all capillary beds.

III.  Together with small arteries, capillaries constitute the "resistance bed" of an organ.

IV.  The blood in the distal capillaries of many tissues has a higher osmotic pressure than the blood in the same proximal capillaries.

V.  In the pituitary vascular portal system, capillaries take up releasing hormones from the hypothalamus.

IV

III

I

II

V

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