Which of the following is NOT true?

all-or-none law says muscles contract completely, partially, or not at all

Which of the following statements about muscle tissue is NOT correct?

The sarcomere is the space between the thick and thin filaments

Which of the following statements is NOT true of the skeletal muscle activity

During contraction, the muscle origin moves towards the insertion

Which of the following lists the structures in order from smallest to largest

Myofilament, myofibril, muscle fiber, fascicle

Which of the following is NOT matched correctly?

Atrophy - condition of sore muscles

Which of the following is NOT a common effect of aging on skeletal muscles?

muscles become larger due to an increase in fat

Which of the following statements is NOT true?

when a muscle relaxes, it pushes on the insertion

A single nerve impulse produces only one contraction because

actylcholine is broken down by acetylcholinesterase during the action pot.

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Muscular Systems Test Review

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Questions 25

Answers

1
The sliding filament theory involves the sliding of the _____ during skeletal muscle contraction as each cross bridge
sarcomere
neuromuscular junction
myosin heads
actin filaments
2
A smooth, sustained contraction is called
a graded response
a muscle filaments
fused tetanus
a summing contractions
3
The heads of the myosin filaments are called ___, link the thick and thin filaments during muscle contractions
Sliding filaments
Sarcomeres
Sarcoplasms
Crossbridges
4
Involuntary, found in the heart
Cardiac
Smooth
Skeletal
5
Which of the following is NOT true?
how forcefully a muscle contracts depends on amount of muscles stimulated
all-or-none law says muscles contract completely, partially, or not at all
graded muscle contractions produced by changing of frequency of muscle stim
a strong contraction results when all motor units are stimulated
6
The condition of skeletal muscle fatigue can be best explained by ____
Inability of muscles to contract for extended period of time
Increased blood supply to the muscle during strenuous exercise
The all-or-none law
The result of oxygen debt
7
Multinucleate cells with obvious striations
Cardiac
Smooth
Skeletal
8
Found in visceral organs
Cardiac
Smooth
Skeletal
9
Which of the following statements about muscle tissue is NOT correct?
In muscle cells, the cytoplasm is called the sarcoplasm
The sarcomere is the space between the thick and thin filaments
The actin filaments are the ones that actually slide during contraction
An individual muscle cell is called a mucsle fiber
10
Which of the following statements is NOT true of the skeletal muscle activity
All muscles have at least two attachments
The bulk of the muscle lies proximal to the joint crossed
During contraction, the muscle origin moves towards the insertion
Typically, muscles cross at least one joint
11
Which of the following lists the structures in order from smallest to largest
Myofibril, muscle fiber, muscle, fascicle
Muscle fiber, fascicle, myofibril, muscle
Myofilament, myofibril, muscle fiber, fascicle
Myofilament, myofibril, fascicle, muscle fiber
12
Branching chains of cells with intercalated discs
Skeletal
Smooth
Cardiac
13
The gap between the motor neuron and the muscle fiber it supplies at the neuromuscular junction is called the______
crossbridge
vasicle
synaptic cleft
motor unit
14
Voluntary, attached to bones
Cardiac
Smooth
Skeletal
15
Slow to fast contractions, but not rhythmic
Smooth
Skeletal
Cardiac
16
Which of the following is NOT a function of the muscular system?
production of movement
hematopoiesis
stabilization of joints
generation of heat
17
Involuntary, no striations
Skeletal
Cardiac
Smooth
18
Which number most closely approximates the number of skeletal muscles in the human body
206
650
Several thousand
About 1000
19
Which of the following is NOT involved in supplying energy for muscle contraction?
aerobic respiration/cellular respiration
creatine phosphate
anaerobic respiration
breakdown of lactic acid
20
Which of the following is NOT matched correctly?
Atrophy - condition of sore muscles
Flaccid - soft and flabby muscles
Muscle tone - continuous partial contractions
21
Which of the following is NOT a common effect of aging on skeletal muscles?
muscles become more stingy due to increase in mass of connective tissue
loss of muscles mass
decrease in muscles strength
muscles become larger due to an increase in fat
22
Which of the following statements is NOT true?
muscles can only pull
when a muscle relaxes, it pushes on the insertion
contractility refers to the muscles ability to shorten
isotonic contractions result in sliding myofilaments and muscle movement
23
A single nerve impulse produces only one contraction because
nerve signals are not strong enough to stimulate more than one contraction
acetylcholine quantities are limited
actylcholine is broken down by acetylcholinesterase during the action pot.
sodium and potassium ions can only move in one direction
24
Which of the following is NOT a result of aerobic exercise on muscles?
greater resistance to fatigue
stronger muscles
bulging muscles
more flexible muscles
25
The connective tissue covering that surrounds an entire muscle is ____
Epimysium
Perimysium
Endomysium
Tendon

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