1. With age, the collagen-containing connective tissue coverings of skeletal muscles increase and the number of muscle fibers decreases. Is meat from an older or a younger animal more tender? Explain. 2. Weight training increases muscle fiber size by increasing the number of myofibrils. Explain. 3. The diaphragm is a muscle that controls inspiration. Is control of the diaphragm voluntary, involuntary, or both? Explain.

1. With age, the collagen-containing connective tissue coverings of skeletal muscles increase and the number of muscle fibers decreases. Is meat from an older or a younger animal more tender? Explain. 2. Weight training increases muscle fiber size by increasing the number of myofibrils. Explain. 3. The diaphragm is a muscle that controls inspiration. Is control of the diaphragm voluntary, involuntary, or both? Explain.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Explain questions no 2 only
Which of the following is a correct sequence (in chronological order of occurrence) within excitation-contraction coupling? a. Synpatic vesicles fuse with the pre-synaptic membrane, Neurotransmitter binds to receptors in the post-synaptic membrane, Neurotransmitter diffuses across the synaptic cleft b. Neurotransmitter binds to receptors in the post-synaptic membrane, Synpatic vesicles fuse with the pre-synaptic membrane, Neurotransmitter diffuses across the synaptic cleft c. Synpatic vesicles fuse with the pre-synaptic membrane, Neurotransmitter diffuses across the synaptic cleft, Neurotransmitter binds to receptors in the post-synaptic membrane
2. Compare and contrast the characteristics of skeletal, smooth and cardiac muscles and identify their locations in the body.
9. Explain the process that occurs to generate a muscle contraction. Name the four major stages and be able to describe the events that happen at each stage.
Predict the effect of the following on muscle contraction:A. Bitten by a black widowB. CurareC. Neostigmine
Slow twitch muscle fibers are characterized by all of the following EXCEPT: O a) used in endurance type of activities O b) contract rapidly and forcefully Oc) resistant to fatigue O d) have a direct relationship to the oxidative energy system
4B. Name the two major factors that influence the strength of a muscle contraction and list the effects they each have. Be sure to describe the different types of muscle contractions (e.g. twitch, tetanus) and what causes them.
1. Compare the excitation-contraction coupling in the three types of muscle. Skeletal muscle Smooth muscle Cardiac muscle Sarcomere/myofibril Thick filament Thin filament Striations I tubules Sarcoplasmic reticulum
The fewer muscle fibers present in a motor unit and the greater the number of motor units in a muscle as a whole: 1. the less likely these muscle fibers will fatigue. 2. the less likely an action potential will be generated in the muscle fibers of that motor unit. 3. the stronger the contractions of muscle fibers in that motor unit.
Which of the following statements relating to the developmental aspects of muscles is false? a. All muscle tissue types arise from myoblasts b. Skeletal muscles become amitotic while smooth muscles regenerate throughout life c. Sarcopenia begins by age 30 and is irreversible d. Body strength per unit muscle mass is the same in both sexes e. none of the above Which of the following structures is located in the head region of the thick filament myosin? a. actin binding site b. ATP binding site c. ATPase enzyme d. all of the above e. none of the above
An autorhythmic muscle type containing mononucleated and striated muscle fibers. cardiac muscle smooth muscle skeletal muscle 2. This type of muscle is found in the lining of the stomach as well as the walls of arteries. cardiac muscle skeletal muscle smooth muscle 3. A muscle type that functions to transport substances through hollow viscera (organs). skeletal muscle cardiac muscle smooth muscle 4. Voluntary, striated and multinucleated muscle. skeletal muscle cardiac muscle smooth muscle
Explain the role of tropomyosin in the muscle contraction process? How are the intercalated discs involved in the contraction of cardiac muscles?