Select the incorrect statement about cardiac muscle cells
a. all of them contract in the heart or none of them contract.
b. they are capable of graded strength of contraction.
c. they are produced constantly after infancy.
d. they have an abundance of mitochondria.
e. they have an abundance of myoglobin.
C
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Why does damaged cartilage heal slowly?
A) Chondrocytes cannot be replaced if killed, and other cell types must take their place. B) Cartilage is avascular, so nutrients and other molecules must diffuse to the site of injury. C) Damaged cartilage becomes calcified, thus blocking the movement of materials required for healing. D) Chondrocytes divide more slowly than other cell types, delaying the healing process. E) Damaged collagen cannot be quickly replaced, thus slowing the healing process.
The patient was in a coma and you forgot to turn them often enough so they developed bedsores.
A) Anemic hypoxia B) Ischemic (stagnant) hypoxia C) Hypoxemic hypoxia D) Histotoxic hypoxia
The blood that flows through the kidneys is
a. normally about 20 to 25% of the total cardiac output. b. all filtered through the glomeruli. c. all used to supply the renal tissue with O2 and nutrients. d. both (a) and (b) above. e. all of these answers.
During an isometric twitch in a skeletal muscle:
A. tension generated by the muscle always exceeds the load on the muscle. B. tetanus occurs. C. sarcomeres do not significantly shorten. D. the whole muscle shortens. E. H zones shorten.