What might happen if the papillary muscles and/or chordae tendineae stopped functioning?
What will be an ideal response?
Blood would leak back into the atria from the ventricles.
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What is the dense outer covering of a long bone that contains many nerve fibers and is responsible for the pain of a fracture?
Which of the following normally occurs when a doctor's reflex hammer taps a patient's patellar tendon?
A. Alpha motor neurons stimulate contraction of extrafusal fibers in extensor muscles. B. Alpha motor neurons stimulate contraction of intrafusal fibers in extensor muscles. C. Golgi tendon organs in the patellar tendon stimulate the contraction of extrafusal fibers of extensor muscles. D. Alpha motor neurons that innervate ipsilateral flexor muscles are stimulated. E. Inhibitory interneurons reduce action potential firing in alpha motor neurons to extrafusal fibers of extensor muscles.
An action potential involves a temporary reversal of polarity across the plasma membrane (that is, the inside of the axon becomes relatively positive compared to the interstitial fluid).
Answer the following statement true (T) or false (F)
Which of the following is mismatched?
A. M line - middle of the H zone B. Actin myofilaments - thin myofilaments C. Z disk - structure between adjacent sarcomeres D. Myosin myofilaments - thin myofilaments E. I band - contains only actin