1. a)Why are muscles not in a contracted state all the time?b)Several hours after the death of an animal, a state of rigor mortis, extremerigidity of the body, occurs. With respect to myosin and actin filaments, why does thisoccur? What causes the body to relax more later in time? Explain. Why can't Myosin V motor proteins "walk" towards the negative end of the actinmolecule? Why do most myosins move toward the positive end? Why do most myosinsmove toward the positive end instead of the negative end? Explain.

Muscles These are defined as the soft tissues that are involved in the movement of the body and in…

Answered: a) Why are muscles not in a contracted…

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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What 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.
Which is true for striated muscles? a) may have spontaneous activity b) is not under the control of the will c) many cell nuclei, located below the membrane, in each muscle fiber.
Why will an increase in the strength of a stimulus cause an increase in the force of contraction in a whole muscle but not in a single muscle fiber?
What factors are responsible for the amount of tension a skeletal muscle develops?
why does a rapid series of muscle twitches yield a stronger overall contraction than a single twitch?
Indicate which of the following are true. Chronically shortened muscles will lose sarcomeres in series in order to maintain ideal amounts of myofilament overlap. Contractile force is proportional to the length of a muscle. Muscle organ contraction is all or nothing. Muscle cells are surrounded by an endomysium. Actin is the thick filament and Z-lines are where the cross-bridges zig-zag to adjacent actin filaments. Muscles with fewer motor units are weaker, i.e., capable of less force. A nerve impulse, calcium, and ATP are necessary for muscle contraction. Tendons attach bones to bones and help to limit the range of motion at joints. Muscle tissue is very dynamic and will respond to chronic stress by becoming stronger (making more myofilaments), chronic contraction by becoming shorter (losing sarcomeres in series), and stretching by becoming longer (adding sarcomeres in series). Myofilaments are actually long strands of proteins.
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The three key ions in muscular contractions are .... A) sodium, calcium, chloride B) calcium, sodium, phosphate C) calcium, chloride, potassium D) sodium, potassium, calcium
What is the energy utilization involved in causing a muscle to contract ?
According to the size principle, which type of muscle fibers are recruited last during a muscle contraction? Group of answer choices: 1.) Type I 2.) type IIB 3.) Type IIA

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a) Why are muscles not in a contracted state all the time? b) Several hours after the death of an animal, a state of rigor mortis, extreme rigidity of the body, occurs. With respect to myosin and actin filaments, why does this occur? What causes the body to relax more later in time? Explain.