Thromboxane is a chemical mediator released by platelets. Thromboxane promotes the aggregation of platelets which results in platelet plug formation during hemostasis. Thromboxane would therefore be classified as a/an ________.
A. paracrine chemical messenger
B. endorphin
C. enkephalin
D. neurotransmitter
E. autocrine chemical messenger
Answer: E
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Which of the following are effects of aging on the digestive system?
A. blood supply decreases B. more likely to develop ulcerations and cancers C. enamel on teeth becomes thinner D. blood supply decreases and more likely to develop ulcerations and cancers. E. blood supply decreases, more likely to develop ulcerations and cancers and enamel on teeth becomes thinner.
Tubular secretion
a. refers to the movement of a substance from the peritubular capillary blood into the tubular lumen b. can occur by active or passive transport mechanisms c. of K+ occurs in the distal and collecting tubules and is stimulated by aldosterone d. of organic ions occurs in the proximal tubule by two distinct types of carriers e. has all of the above characteristics
Compare negative and positive feedback and explain why negative feedback is important in homeostasis
What will be an ideal response?
The quadriceps femoris muscles are located in the posterior thigh.
Indicate whether the statement is true or false