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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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13) when testing the ability of a frog’s skeletal leg muscle to move, which chemical would be best?
a) somatostatin
b) epinephrine
c) acetylcholine
d) dopamine
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- The experiment that crossed the nerve from a muscle that had a short contraction time "a fast muscle" to a muscle with a slower contraction profile and from the slower muscle to the faster muscle demonstrated that the nerve or activity of the muscle had no effect on properties of the muscle fibers. a.) True b.) Falsearrow_forwardWhat would happen without input from gamma motor neurons? A) Information about velocity would continue, but information about length would no longer be possible. B) The spindles would be unable to provide feedback as the muscle contracted. C) Neither the intrafusal nor extrafusal fibers would contract. D) The extrafusal fibers would not contract, but the intrafusal fibers would continue to contract.arrow_forwardPlease answer 2) Lactic acid contributes to muscle fatigue because it affects: a) the enzyme that activates myosin. b) the availability of calcium. c) the availability of oxygen. d) neurotransmitter secretionarrow_forward
- 7. Organophosphates, which are found in a lot of insecticides, block the activity of acetylcholineesterase. What might be a result of blocking this important enzyme? A)Hyperstimulation of the nicotinic receptor B)Accelerated ACh breakdown in the synaptic cleft C)Muscle paralysis due to limited activity in the muscle cellarrow_forwardIn order for the muscles to contract ______ must bind to receptors in the muscles. a) Serotonin b) Dopamine c)Glutamate d)Acetylcholinearrow_forwardWhich type of muscle do you have in your digestive system? A) Cardiac MuscleB) Striated MuscleC) LigamentsD) Smooth Musclearrow_forward
- Pick the right order for muscle contraction a) ATP attaches to myosin, muscle cell uses calcium, action potential spreads b) Calcium release, binding sites on actin are exposedmyosin binds to actin c) Myosin binds to actin, myosin uses calcium, cell gets shorter d) Action potential is received , cell gets shorter, myosin grabs actinarrow_forwardPlease answer both questions. At some point, increasing stimulus strength will not result in a larger contraction strength. a) true b) false Like nerves, muscles must fully return to their initial position before they can be stimulated again. a) true b) falsearrow_forwardNeurotransmitters that influence the effect of other neurotransmitters when released at the same time are called: A) major neurotransmitters B) neuromodulators C) excitatory neurotransmitters D) inhibitory neurotransmittersarrow_forward
- Please answer all questions Following death, muscles enter a period of sustained contraction called rigor mortis. This develops because: a) the Na+/K+ active transport pump fails. b) there isn't any more neurotransmitter secretion. c) there isn't any ATP to break actin-myosin bonds. d) calcium is not returned to the cisternae. If a muscle is stimulated to contract at maximum tension yet brief periods of relaxation are possible, the muscle is demonstrating: a) twitch. b) summation. c) incomplete tetany. d) complete tetany.arrow_forwardTransmission of electrical signals in nerve and muscle cell is mediated by opening and closing of: 1) ion channels in the nuclear envelope 2) ion channels in the plasma membrane 3) the electron transport chain 4) the sodium potassium ATPase in the plasma membranearrow_forwardPlease help in answering this question - more than one answer may be correct: Cardiac muscle conducts myogenic signal in a manner similar to A) parasympathetic neurons B) single-unit smooth muscle C) motor neurons D) skeletal muscle E) multi-unit smooth musclearrow_forward
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