What structure, found surrounding PNS axons, is NOT found surrounding CNS axons?

A. Neurilemma
B. Myelin sheath
C. Plasma membrane
D. Nodes of Ranvier


Answer: A

Anatomy & Physiology

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Layers of bony matrix at the outer and inner surfaces of bone and covered by the periosteum and the endosteum are

A) concentric lamellae. B) osteons. C) Haversian systems. D) interstitial lamellae. E) circumferential lamellae.

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At which location in the figure do sperm and seminal vesicle secretions first join together in their path to the exterior?

a) C b) J c) E d) K e) L

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____________________ refers to the series of events linking muscle excitation to muscle contraction

Fill in the blank(s) with correct word

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Which of the following statements regarding regulation of local blood flow is true?

A. Increased levels of CO2 increase the contraction of precapillary sphincters. B. Tissue need for O2 and amino acids will cause precapillary sphincters to contract. C. Blood flow through capillaries is continuous. D. Contraction of precapillary sphincters will increase blood flow to a capillary bed. E. Increased metabolic rate in a tissue increases capillary blood flow into the tissue.

Anatomy & Physiology