Energy sources available to form ATP in muscle fibers are 1) phosphorylation of
ID: 3516567 • Letter: E
Question
Energy sources available to form ATP in muscle fibers are
1) phosphorylation of ADP by creatine phosphate
2) oxidative phosphorylation of ADP in the mitachondria
3) phosphorylation of ADP by glycolytic pathway in the cystosol
a. (1) and (2) above are correct
b. (2) and (3) above are correct
c. (1) and (3) above are correct
d. (1) (2) and (3) above are correct
e. none of the above is used as energy sources in the muscle
Leaning towards A or D, need explained better.
Which of the following statements concerning smooth muscle is incorrect
a. Smooth muscle can maintain tension wit comparatively less ATP consumtion than skeletal muscle
b. smooth muscle lacks troponin
c. smooth muscle generates less contractile tension per unit cross sectional area compared to skeletal muscle
d. the range of lengths over which smooth muscle is able to develop near maximal tension is much greater than for skeletal muscle
e. a hollow organ enclosed by smooth muscle can accomodate variable volumes of contents with little change in the pressure exerted on the contents.
Leaning towards C or D; need explained.
which of the classes of hormones gains direct entry inside its target organ cells?
a. peptides
b. catecholamines
c. steroids
d. thyroid hormone
e. both c and d
Explanation / Answer
1)ans:D
Energy in the form of ATP in muscle contraction is provide by three pathways
1)creatine phosphagen system
2)glycolytic pathway in cytosol
3)oxidative phosphorylation in mitochondria
2)ans:c
Smooth muscle can produce same contractile tension per unit cross sectional area compared to skeletal muscle but it is slow hence option c is incorrect
3)ans is E
Both steroid and thyroid are lypophilic hormones so can easily enter the cells hence have receptors inside the target cells
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