_____ migrate to injured tissue and engulf dying cells and abnormal extracellular substances.
a. Erythrocytes
b. Lipids
c. Neutrophils
d. Phagocytes
Ans: d. Phagocytes
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Saliva has a pH of 7.7; arterial blood has a pH of 7.45. That means:
a. arterial blood is more alkaline than saliva b. arterial blood is more acid than saliva c. saliva has more hydrogen ions than arterial blood d. both A and C above
The ability of stretched smooth muscle to rearrange its cross bridge attachments so that muscle tension decreases is called the __________ response (a two-word answer)
Fill in the blank(s) with correct word
During normal expiration,
A) elastic recoil of stretched muscles helps return the thorax to its resting volume. B) elastic recoil of stretched muscles helps return the thorax to its resting volume and the internal intercostal muscles are required. C) the internal intercostal muscles are required. D) elastic recoil of stretched muscles helps return the thorax to its resting volume, the internal intercostal muscles are required, and the abdominal muscles become involved. E) the abdominal muscles become involved.
In the context of endocrine regulation, permissiveness refers to
a. one hormone enhancing the responsiveness of a target cell to another hormone. b. the combined action of several hormones acting complementary to one another. c. the expression of receptors by a cell allowing it to respond to a hormone. d. the increase in receptor number that occurs on the surface of a target cell during hyposecretionof a hormone . e. none of these.