Homework Answers
Answer
Option D) They are being actively pumped back into the
sarcoplasmic reticulum
- Calcium is very important for a muscle contraction and are stored in sarcoplasmic reticulum in the muscle fiber.
- It helps in exposing myosin binding sites on actin.
- During relaxation phase, calcium ions are released from troponin.
- They are actively pumped back into the sarcoplasmic reticulum. This results in covering of active myosin binding sites.
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please answer within 5 mins! 46) Which of the following is referred to as the period...
please answer within 5 mins!
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13. During skeletal musele contraction, whet substance does the sarcoplasmic reticulum store and release? A. acetyicholine B. sodium D. calcium 34. What stimalates the sarcoplasmic reticulum (SR) to release this chemical? A. the voltage change from the muscular action potential traveling down the transverse (1) tubules B. the binding of acetylcholine to ligand-gated channels in the transverse tubules C. direct stimulus from the neural action potential D, the binding of myosin to actin 35. Transverse (T) tubales are extensions of...
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please answer within 5 mins!
46) Which of the following is referred to as the period of lost excitability in skeletal muscle fibers? a) refractory period b) contraction period c) latent period d) relaxation period e) wave summation 47) Increasing the number of active motor units within a skeletal muscle is called a) wave summation. b) fused tetanus. c) motor unit recruitment. d) muscle tone. e) flaccidity. 48) Which of the following microscopic structures is only found in the cardiac...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move closer together as the myosin heads move toward the plus ends of the actin filaments. The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction. An action potential in the muscle cell plasma membrane leads to voltage-gated calcium channels...
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