Letter D represents the structure of a(n) ________
C
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What is the significance of the change in permeability of the sarcolemma in muscle contraction?
A) This change is caused by the displacement of actin and myosin molecules. B) This change is caused by a neurotransmitter. C) It has no role, because this phenomenon does not occur. D) It causes the release of calcium ions. E) None of the answers are correct.
The mechanical and chemical breakdown of food is called ________.
A. ingestion B. digestion C. absorption D. defecation
A donkey can be trained to be ridden
Indicate whether the statement is true or false
Which of the following statements regarding whole-muscle contraction is TRUE?
A. The order of recruitment of motor units in a muscle is such that the last units recruited are those that fatigue most readily. B. The order of recruitment of motor units in a muscle is such that the first units recruited generate the most tension. C. Motor units whose motor neurons have large-diameter cell bodies are recruited first, while motor units with smaller-diameter motor neurons are only activated as the level of activation in the spinal cord increases. D. The order of motor unit recruitment is independent of the size of the alpha motor neuron that innervates them. E. Recruitment of one fast-glycolytic motor unit provides a smaller increment in whole-muscle tension than recruitment of one slow-oxidative motor unit.