Which of the following is not true of endothelium?

A. It is avascular.
B. It secretes substances.
C. It consists of a single layer of cells.
D. It allows for rapid diffusion of substances.
E. It contains a sheet of collagen fibers.


Answer: E

Anatomy & Physiology

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In the reaction shown, identify the role of each of the participants.



1. CO2 + H2O
2. carbonic anhydrase
3. H2CO3

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Receptor-mediated endocytosis is used to remove low-density lipoproteins (LDLs) from the blood. What effect would defective LDL receptors have on a patient’s cholesterol levels and overall risk for heart disease?

What will be an ideal response?

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The cerebral arterial circle is an anastomosis of arteries around the

A. pons. B. frontal lobes. C. sella turcica. D. medulla oblongata. E. dural venous sinuses.

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Neurotransmitters that cause skeletal muscle contraction are normally stored in

A) myofibrils. B) motor neuron axon terminals. C) motor units. D) motor end plates. E) actin.

Anatomy & Physiology