1. After acetylcholine binds to the receptors on the motor end plate A. the tria
ID: 3520555 • Letter: 1
Question
1. After acetylcholine binds to the receptors on the motor end plate A. the triads wrap around the sarcomere.X B the cross-bridges detach. action potential travels down to the terminal cisternae to release Ca D. the sarcolemma releases Ca" ions. X 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. 4r Anemia is A. when oxygen delivery to peripheral tissues is interfered with. X B. the result of an increase in hematocrit. C, always caused by hemorrhage. D. a result of leukocytosis. 5. Which of the following is correet? Calcium is responsible for moving the troponin-tropomyosin complex away from the myosin binding site on actin. YB. 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 B. smooth muscle. C. cardiac muscle. A. skeletal muscle. 7. The type of muscle fiber that is most resistant to fatigue is the 8. A person with a low hematocrit (below the normal range) fiber. A. fast B.) slow C. intermediate A. does not produce erythropoietin. B. has polycythemia. does not have albumins. D., may have aplastic anemja.Explanation / Answer
1. The correct answer is - C . The action potential is travels down to the terminal cisternae to release ca2+.
Additional Information :
After binding of Acetyl choline with the receptor of motor end plate, it opens the ion channel which permits sodium ion ( in most cases) to enter into the cell and produces End Plate Potential. This give rise to action potential which travels through terminal cisterneae initiate muscle contraction releasing calcium from sacoplasmic reticulum.
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2. The correct answer is - D. None of the above will occur.
Partial pressure of oxygen in the alveolar sac not directly associated with bronchoconstrictions, vasodilation or vasoconstriction.
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3. The correct answer is - A.The Diaphragm contracts.
Addiotional Information:
Dorsal respiratory group of neurone situated in the medulla, when it stimulated it send impulses to the respiratory muscles (mainly Diaphragm) , which then contracted and stimulates the respiration.
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4. The correct answer is - A. When oxygen delivery to peripheral tissues in inerfared with.
Additional InInformation:
During Anaemia the number of healthy red blood cells in blood is reduced greatly and due to this the tissue oxygenation is sufferd a great deal.
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