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
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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.
In the reaction shown, identify the role of each of the participants.
1. CO2 + H2O
2. carbonic anhydrase
3. H2CO3
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.
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?