The control center of a homeostatic mechanism
A. brings about change to the internal environment.?B. integrates sensory input and signals for change as needed.?C. is a change in the external environment.?D. detects a change in a variable that is being regulated.
B
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Second messenger molecules directly
A) change enzyme activity. B) change regulation of gene expression. C) increase intracellular calcium concentration. D) change the regulation of ion channels. E) All of the answers are correct.
Tina is a hard-working sales clerk in a busy department store. She has stood completely still behind the check-out counter for an 8-hour shift. At the end of Tina's shift she finds that she feels somewhat dizzy and guesses that her blood pressure is quite low. All of the following factors normally contribute to homeostatic blood pressure regulation. Which one is most likely contributing to her symptoms?
A. Increased sympathetic tone B. Decreased skeletal muscle pump C. Increased activity of the pulmonary pump D. Defective baroreceptor detection in the carotid artery E. All of these
The medullary cavity of a long bone is lined with
A) periosteum. B) endosteum. C) lacunae. D) lamellae. E) osteon.
Vasomotion can raise or lower blood pressure throughout the body.
Answer the following statement true (T) or false (F)