IdeWhat is the mechanism most often used to maintain a variable homeostatically?
Give an example of this mechanism in the human system and think of one example of a non-biological application of this mechanism and describe the main components and how it works for each (you can use flow diagrams).


Non-biologicalntify the correct statements about excitation of a muscle fiber. Identify all that apply. a. An action potential arriving at the synaptic end bulb of the somatic motor neuron causes voltage gated calcium channels to open b. The influx of sodium ions causes acetylcholine to be released into the synaptic cleft. C. Acetylcholine binds to voltage-gated sodium channels to cause depolarization of the sarcolemma d. Binding of acetylcholine to its receptor causes an influx of sodium ions and lowers the threshold voltage e Depolarization of the sarcolemma is the result of sodium ions entering the muscle fiber through voltage-gated sodium channels f. The action potential will travel in one direction along the sarcolemma due to inactive voltage-gated sodium channels (refractory phase). 24. Identify the incorrect statements pertaining to the coupling process of muscle contractions. Identify all that apply. a. The action potential travels into the transverse tubules of the sarcolemma b. The receptor on the sarcoplasmic reticulum detects the acetylcholine Calcium diffuses with its concentration gradient from the sarcoplasmic reticulum into the sarcoplasm d. Calcium binds to troponin, causing troponin to dissociate from myosin. e. Tropomyosin shifts and myosin binding sites on actin are exposed. 25. Identify the correct statements pertaining to ATP use during muscle excitation coupling contraction relaxation. Identify all that apply a. The Na K pumps at the sarcolemma use 1 ATP to pump out 3 Nations and pump in 2 K b. The Cal pumps in the sarcolemma use ATP to pump Care out of the muscle fiber after it dissociates from troponin Before tropomyosin shifts to expose actin, 1 ATP must bind to tropomyosin’s head d. Before myosin can reorient toward actin, ATP must bind to

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