True or False The flushed appearance of skin is due to the hemoglobin in blood.TrueFalse In muscles, a single motor neuron may synapse with only one musclefiber.TrueFalse

Tissue is a part of structural organization of the body which is formed of various cell . Tissue is…

Answered: The flushed appearance of skin is due…

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The flushed appearance of skin is due to the hemoglobin in blood. True False

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 2RE

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True or False

The flushed appearance of skin is due to the hemoglobin in blood.
True
False

In muscles, a single motor neuron may synapse with only one muscle
fiber.
True
False

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In the diagram below, label the fine structure of a muscle, down to one of its myofibrils. Identify the basic unit of contraction in a myofibril.
The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filament
Every skeletal muscle fiber is supplied by a motor neuron at the NMJ. Watch this video (http://openstaxcollege.org/l/skelmuscfiber) to learn more about what happens at the neuromuscular junction. (a) What is the definition of a motor unit? (b) What is the structural and functional difference between a large motor unit and a small motor unit? Can you give an example of each? (c) Why is the neurotransmitter acetylcholine degraded after binding to its receptor?
Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the above
The muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous stimulation is still present in the synapse The activity of helps to remove this neurotransmitter. myosin action potential tropomyosin acetylcholinesterase
Cheetahs and human sprinters tend to have a high proportion of ________fibers in their leg muscles. a. white b. fast red c. slow red
Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.
Nerve impulses first stimulate a skeletal muscle fiber at _______. a. T tubules b. sarcomeres c. neuromuscular junctions d. actin binding sites
Skeletal muscles are controlled by ______ . a. sympathetic neurons b. parasympathetic neurons c. somatic motor neuron d. somatic sensory neurons
Using pyramidal motor tract as a template, describe the voluntary control of skeletal muscles being sure to use appropriate course terminology. Start from the very first neuron and end with neural innervation onto muscle fiber.
___________ crosses the synapse between a motor neuron and a muscle fiber and is responsibile for stimulating muscle contraction.