Secondary lymphoid structures may contain
A) lymph.
B) sinusoids.
C) macrophages.
D) lymphocytes.
E) All of the answers are correct.
E) All of the answers are correct.
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Partial constriction due to constant sympathetic stimulation of blood vessels is known as
A) vasoconstriction. B) vasodilation. C) arteriosclerosis. D) vasomotor tone. E) aortic reflex.
Which of the following structures protect the brain by preventing the movement of harmful substances and pathogens from the blood into the brain tissue?
a) Dura mater b) Arachnoid mater c) Cerebrospinal fluid d) Blood brain barrier e) All of these choices
Which are differences between cardiac muscle tissue and skeletal muscle tissue?
a: The sarcoplasmic reticulum in cardiac muscle is less extensive. b: The sarcoplasmic reticulum in cardiac muscle is more organized. c: Cardiac muscle has intercalated discs; skeletal muscle does not. d: Cardiac muscle has 1 or 2 nuclei per cell; skeletal muscle has multiple nuclei per cell. e: Cardiac muscle has more well-defined terminal cisternae. A. a, c, d B. a, c, e C. b, c, e D. a, b, e E. b, d, e
Cell membranes consist of lipid, protein, and carbohydrate in relative amounts that vary according to cell type. Describe the relative proportions of these substances in three structures, and relate these differences to cell function where possible.
What will be an ideal response?