1. After acety lcholine binds to the receptors on the motor end plate A. the tri
ID: 3520547 • Letter: 1
Question
1. After acety lcholine binds to the receptors on the motor end plate A. the triads wrap around the sarcomere. B. the cross-bridges detach. C. the action potential travels down to the terminal cisternac to release Ca" D. the sarcolemma releases Ca" ions. 2. When the partial pressure of oxygen in an alveolar sac is low A. bronchoconstriction of the bronchioles leading to that sac will occur. B. vasoconstriction of the capillary bed perfusing that sac will occur. C. vasodilation of the capillary bed perfusing that sac will occur. D. None of the above will occur. 3. When the dorsal respiratory group is stimulated A. the diaphragm contracts. B. the diaphragm relaxes. C. exhalation occurs. D. active breathing begins. 4. Anemia is A. when oxygen delivery to peripheral tissues is interfered with. B. the result of an increase in hematocrit. C. always caused by hemorrhage. D. a result of leukocytosis. 5. Which of the following is correct? A. Calcium is responsible for moving the troponin-tropomyosin complex away from the myosin binding site on actin. B. ATP is responsible for moving the troponin-tropomyosin complex away from the myosin binding site on actin. C. Calcium is responsible for separating the actin-myosin cross bridges. D. ATP is responsible for causing calcium to be released into the sarcomere. 6. The muscle type we have conscious control over is A. skeletal muscle. B. smooth muscle. C. cardiac muscle. 7. The type of muscle fiber that is most resistant to fatigue is the fiber. A. fast B. slow C. intermediate 8. A person with a low hematocrit (below the normal range) A. does not produce erythropoietin. B. has polycythemia. C. does not have albumins. D. may have aplastic anemia.Explanation / Answer
1) The correct answer is C
Acetylcholine binds to the receptor on the postjuctional membrane,after this action potential reaches to the terminal cisternae to release calcium ions which results into contraction of muscle.
2) the correct answer is B
When partial pressure of oxygen is low,hypoxia occurs,this is compensated by vssoconstriction of capillary bed perfusing it,in the lungs whereas in other systemic arteries vasodilation occurs.
3) The correct answer is A that is diaphragm contracts.
It initiates inspiration at rest.
4) The correct answer is A.
When oxygen delivery to tissues is reduced as it is the Hb which carries oxygen and in anemia,there is reduced number of red cella and so the hemoglobin.
It is not always caused by haemorrhage,it may be due to nutritional deficiency that is of iron and folate or congenital.
5) the answer is A.
Calcium ions binds to troponin and expose the binding site on actin.
6) the correct answer is A that is skeletal muscle.
They are also called as voluntary muscle as they can be controlled by consciousness.
7) the answer is B that is slow.
Slow twitch muscle fibres or type 1 fibres are most resistant to fatigue.
8) the answer is D that is aplastic anemia.
Low hematocrit means less number of red cells in the blood,it can be only aplastic anemia in the above given conditions.
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