114.What is the contraction in graph (d) called? a.Complete tetanus b.Incomplete tetanus c.Twitch d.Wave summation e.Treppe
115.What is the contraction in graph (a) called?
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116.What is thought to happen in a muscle during the response shown in graph (a)?
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6.Match the term with its description 1. Thyroid hormone 2. Testosterone 3. Epinephrine 4. Myoglobin 5. Calmodulin a.Primary sex hormone in males b.Elevates the rate of energy consumption in resting and active skeletal muscles c.Stimulates muscle metabolism and increases duration and stimulation of the force of a contraction d.Activates myosin light chain kinase e.Red pigment in slow fibers 1-B; 2-A; 3-C; 4-E; 5-D 7.Match the term with its description 1. Skeletal muscle
2. Muscle fascicle 3. Muscle fiber 4. Myofibril 5. Sarcomere a.Surrounded by endomysium and contains myofibrils b.Surrounded by sarcoplasmic reticulum and consists of sarcomeres c.Surrounded by epimysium and contains muscle fascicles d.Surrounded by perimysium and contains muscle fibers e.Contains thick and thin filaments 1-C; 2-D; 3-A; 4-B; 5-E 1.Glucose breakdown through glycolysis and mitochondrial activity provides the ATP needed to power muscular contractions.True 2.A thin filament is constructed from actin, tropomyosin, troponin, and nebulin.False
Chapter 12 P. 285 36.The following are the main steps in the generation of an action potential 1. Sodium channels are inactivated 2. Voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization 3. Sodium channels regain their normal properties 4. A graded depolarization brings an area of an excitable membrane to threshold 5. A temporary hyperpolarization occurs 6. Sodium channel activation occurs 7. Sodium ions enter the cell and depolarization occurs The proper sequence of these events is
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47. The following are the steps involved in transmission at a cholinergic synapse 1. Chemically gated sodium channels on the postsynaptic membrane are activated 2. Calcium ions enter the synaptic knob 3. Acetylcholinesterase hydrolyzes acetylcholine 4. An action potential depolarizes the synaptic knob at the presynaptic membrane 5. The synaptic knob reabsorbs choline 6. Acetylcholine is released from storage vesicles by exocytosis 7. Acetylcholine binds to receptors on the postsynaptic membrane
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