Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Question
A)Fill in the blanks below regarding sarcomeres:
In a sarcomere, thin filaments are composed of................. proteins while thick filaments are composed of.................. proteins.
The H-band/zone of a sarcomere contains only........................ filaments.
Before a muscle contraction, calcium ions are stored in the .................. that surrounds the sarcomere.
When released, calcium binds to................. proteins to displace them so myosin can bind to actin.
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- Mr. White has cerebral palsy and suffers severe muscle spasms as a result of his condition. He is prescribed the drug dantrolene, which prevents the release of calcium ions from the SR. Explain how this will treat his muscle spasms.?arrow_forwardDefine myoblastarrow_forwardDefine and describe the function of a sarcomere.arrow_forward
- A sarcomere contracts when a) Thin filaments (actin) slide b) Thick filaments (myosin) slide c) Thin filaments (actin) contract d) Thick filaments (myosin ) contractarrow_forwardA skeletal muscle contains, (a) connective tissues. (b) blood vessels and nerves.(c) skeletal muscle tissue. (d) a, b, and c are correctarrow_forwardIntermediate filaments are composed of?arrow_forward
- Can you match the sacromere anatomy with the proper answer from the list below the table graph? Sarcomere Anatomy Description/Reaction Thin Filaments ? Thick Filaments ? A Band ? I Band ? M Line ? H Zone ? Z Disc ? A) G-Actin, F-Actin, Troponin, Tropomyosin B) Myosin C) Bisected by the M Line, this area shows only the thick filaments without any thin filamentous overlap D) The point of origin for myosin filaments found in the center of the sarcomere E) An area in the center of the sarcomere marked by the entire length of the thick filaments F) A space between sarcomeres with the z-disc in the center; this region shows Actin's anchorage points and extension without myosin overlap G) Anchoring point for the thin filamentsarrow_forwardCardiac muscle cells differ from skeletal muscle cells because: a. They can respond to neurotransmitters.b. They are striated.c. They contain intercalated discs and gap junctions.d. They require calcium for contraction.arrow_forwardThe bundle of dense regular connective tissue that attaches a skeletal muscle to bone is called a(n) a. tendon. b. ligament. c. endomysium. d. fascicle.arrow_forward
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