Chapter 9 - Although there are no sarcomeres smooth muscle...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Although there are no sarcomeres, smooth muscle still possesses thick and thin filaments. True Whereas skeletal muscle cells are electrically coupled, smooth muscle cells appear to be chemically coupled by gap junctions. False Single-unit smooth muscle is found in the intestines. True A resting potential is caused by a difference in the concentration of certain ions inside and outside the cell. True The effect of a neurotransmitter on the muscle cell membrane is to modify its ion permeability properties temporarily True When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands move closer together but do not diminish in length. True The more slowly a skeletal muscle is stimulated, the greater its exerted force becomes False Contractures are a result of a total lack of ATP. True Smooth muscles relax when intracellular Ca2+ levels drop but may not cease contractions. True Recruitment is an option in a single-unit smooth muscle cell. False 1) With muscular dystrophy ________. A) muscles decrease in size due to loss of fat and connective tissue B) muscle fibers degenerate and atrophy C) most forms do not appear to be inherited D) most cases appear in young females 2) Which muscle cells have the greatest ability to regenerate? A) skeletal B) cardiac C) smooth D) no muscle can regenerate 3) Most muscles contain ________. A) muscle fibers of the same type B) a mixture of fiber types C) a predominance of slow oxidative fibers D) a predominance of fast oxidative fibers 4) Fatigued muscle cells that recover rapidly are the products of ________. A) intense exercise of long duration B) intense exercise of short duration C) slow exercise of long duration D) slow exercise of short duration 5) The strongest muscle contractions are normally achieved by ________. A) increasing stimulus above the threshold B) increasing stimulus above the treppe stimulus C) increasing the stimulation up to the maximal stimulus D) recruiting small and medium muscle fibers 6) Which of the following would be recruited later in muscle stimulation when contractile strength increases? A) motor units with the longest muscle fibers B) many small motor units with the ability to stimulate other motor units C) large motor units with small, highly excitable neurons D) motor units with larger, less excitable neurons 7) Which of the following is not a usual result of resistance exercise? A) increase in the efficiency of the respiratory system B) increase in the efficiency of the circulatory system C) increase in the number of muscle cells D) increase in the number of myofibrils within the muscle cells 8) In skeletal muscle contraction, calcium apparently acts to ________. A) increase the action potential transmitted along the sarcolemma
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 7

Chapter 9 - Although there are no sarcomeres smooth muscle...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online