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What portion of the myofilament structure slides during a contraction?
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What prevents actin myofilaments from sliding backward when a myosin head releases?
During contraction, there are always some myosin heads attached to the actin myofilament when other myosin heads are detaching.
Which structure is responsible for keeping the myocardial cells together during contraction?
desmosomes
What is a Eccentric muscle contraction?
That is the negative portion of a movement. Lowering the weight during a bench press
What acts as ATPase during the contraction cycle of muscle?
myosin cross-bridges
Structure derived from the foregut portion of the gut tube during development?
pharynx to part 2 of the duodenum
Which region of a sarcomere shortens during contraction?
During a contraction, the I bands and H zone of a sarcomere contract. The A bands remain unchanged.
What muscle contraction occurs in the biceps brachii during the upward phase of the bicep curl?
a concentric contraction- a concentric contraction involves the muscle length, shortening during a contraction! YA-trick-YA!
What happens to a muscle contraction if there is an excess amount of either Ca2 plus or ATP present during the contraction?
During muscle contraction the actin heads pull the sarcomere closed
The muscle decreases in muscle length during contraction but tension is the same?
Isotonic contraction
During which portion of the cardiac cycle is it possible to induce extra systole?
Extrasystole is an extra ventricular systole that happens during the begging of relaxation (repolarization). Since the cardiac is able to depolarize only after repolarization, any stimulus upon the repolarization period created an increased ventricular contraction or which is also called extrasystole but not a new contraction.
Is it true or false that during isometric contraction the energy used appears as movement?
during isometric contraction, the energy used appears as movement
During muscle contraction....... attach to ...............?
Troponin
