ANP1105- Midterm 1 exam 2022/2023 with 100% correct answer

Potassium 1. Immediately after an action potential has peaked, which cellular gates open? Store calcium ions The major function of the sarcoplasmic reticulum in muscle cells is to Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules What is the role of tropomyosin in skeletal muscles? A. Tropomyosin is the name of a contracting unit B. Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules C. Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules D. Tropomyosin is the receptor for the motor neuron neurotransmitter Acetylcholine The neurotransmitter released at neuromuscular junctions between motor axons and skeletal muscle is: ground substance, fibers, and cells The 3 Main components of connective tissue are Axon hillock (initial segment) The region of the neuron where the action potential is first generated is called the hypertonic solution Crenation (cell shrinking) occurs when red blood cells are placed in a(n): actin In the sliding filament model of muscle contraction, the ____ myofilaments move toward each other Produce only graded potentials Dendrites ATP is required to release the attached actin and myosin molecules Rigor mortis occurs because The hyperpolarization undershoot occurs because K ion gates are slow to close Which of the following statements about an action potential is true? A. Threshold is usually 0mV B. The hyperpolarization undershoot occurs because K ion gates are slow to close C. Inactivation Na ion gates respond more rapidly than activation Na gates D. Action potentials decrease in amplitude with distance traveled E. A second depolarization can occur during the absolute refractory period if the stimulus is greater than threshold