18. Malathion interferes with the enzyme cholinesterase (found synaptic clefts). WhenMalathion is sprayed on insects, they undergo continuous muscular contraction. Thesecontractions occur becausea. Acetylcholine dissolves the actin and myosin filamentsb. Acetylcholine is not destroyed and therefore there is no refractory periodc. Cholinesterase initiates the release of hormones needed for the muscular contractiond. Cholinesterase increased the manufacture of ATO, and this increases energy forcontractions19. Response to a stimulus within the central nervous system differs from that of a reflex arcbecausea. Depolarization does not occur along the reflex arcb. No acetylcholine is released in the central nervous systemc. There is no interpretation of the information within the reflex arcd. Nerve impulses travel in the central nervous system at a greater speed

A broad-spectrum insecticide from the chemical family organophosphates used in public recreation…

Answered: 18. Malathion interferes with the…

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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H a. Mechanical Ob. Thermal Oc. Mechanical, thermal, and chemical d. Chemical QUESTION 7 What do we mean by the somatic motor system? Oa. Cardiac muscle O b. The smooth muscles and glands O c. Skeletal, smooth, and cardiac muscle Od. The skeletal muscles and the parts of the nervous system that control them QUESTION 8 esc How does the nervous system grade the force of muscle contraction? O a. Only by recruiting additional motor units b. Only by varying the firing rate of the motor neurons c. By varying the firing rate of the motor neurons and by recruiting additional motor units O d. By using more motor neuron pools Click Save and Submit to save and submit. Click Save All Answers to save all answers. Type here to search - f1 ? 1 (6) 2 # 3 O Et f4 LA IOI 4 fs % 5 f6 A hp 6 & 7
Put the following events of excitation-contraction coupling in the order in which they occur.1. Excitation2. Sarcomere shortening3. Generation of muscle tension4. Neural control5. Contraction cycle begins6. Release of calcium ions Group of answer choices 1,2,5,6,3,4 4,1,5,2,6,3 6,1,4,2,5,3 4,1,6,5,2,3 1,4,6,2,5,3
Response to a stimulus within the central nervous system differs from that of a reflex arc because a. Depolarization deos not occur along the reflex arc b. No acetylcholine is released in the central nervous system c. There is no interpretation of the information within the reflex arc d. Nerve impulses travel in the central nervous system at a greater speed
1. When this is released by the synaptic vesicles, it causes a change in the muscle fiber membrane potential that spreads along the T tubules. a - Acetylcholine (ACh) d - a, b, and c c - ATP b - calcium
12. Draw one labeled graph with two myograms: a single twitch contraction for a Type 1 fiber, and one for a Type 2X fiber: Label the axes, stimulus, and lag, contraction, and relaxation phases, with appropriate relative lengths and amplitudes. THEN explain what Ca* ions are doing in the contraction phase versus the relaxation phase.
Muscle contractions where the muscle shortens but tension remains constant are called A. isometric B. hypermetric C. hypotonic D. isotonic E. hypertonic
Which of the following correctly lists the structures that make up a motor unit? a. motor neuron plus some of the muscle fibers it innervates b. motor neuron plus all of the muscle fibers it innervates c. motor neuron plus one of the muscle fibers it innervates d. all of the above e. none of the above
The Interstitial Cells of Cajal (ICC) generate "slow waves" which refer to A. slow action potentials. OB. phasic contractions. C. tonic contractions. D. oscillating resting membrane potentials. OE. oscillating release of paracrine factors. in smooth muscle.
When comparing cardiac muscle cells and skeletal muscle cells, Select one: a. only skeletal muscle has a plateau phase in its contraction cycle. b. both possess intercalated discs. c. action potentials are conducted from cell to cell only in cardiac muscle. d. both are voluntary. e. the rate of action potential propagation is faster in cardiac muscle.
The factor(s) that determine the duration of a twitch in various types of fibers is the speed of the a. movement of Na+ across their membranes only. b. removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP. c. removal of Ca2+ ions from the sarcoplasm only. d. removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP and movement of Na+ across their membranes. e. hydrolysis of ATP only.
How is the muscular contraction stopped (i.e.: how does a muscle relax after contraction)? 1. The brain stops sending the nerve impulse that commands the muscle to contract, interrupting communication at the neuromuscular junction 2. Acetylcholineesterase (AChE) is released into the synaptic cleft to destroy any remaining Acetylcholine 3. No mechanism is necessary. When the antagonist begins to contract, it forces relaxation and stretch of the agonist muscle. 4. Relaxation occurs as the myosin heads are "snapped" off of the thick filaments. This interrupts the crossbridge and allows for muscles to stretch 5. Relaxation only occurs if the brain sends a "stop" signal to the muscle
24. Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? A. Smooth muscle cells contract in response to an extracellular inward-Calcium-current. B. Skeletal muscle cells contract in response to an extracellular inward-Calcium-current. C. Striated muscle cells contract in response to an extracellular inward-Calcium-current. D. No type of muscle cell requires an extracellular inward-Calcium current for normal C. contractile-function. D. Isotonic : Isometric

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