Test
Study Guide: Muscle Contraction
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Preguntas del test (46)
1Which of the following is not a general function of muscle tissue?
- Amovement
- Bprotection
- Cheat production
- Dposture
2The skeletal muscle fiber characteristic of excitability directly results in these cells being capable of
- Aresponding to nerve signals
- Bshortening
- Creturning to resting length after contracting
- Dproducing heat
3The correct order of arrangement of skeletal muscle cells, from largest to smallest is
- Afiber, myofibril, myofilament
- Bmyofibril, myofilament, fiber
- Cmyofilament, myofibril, fiber
- Dfiber, myofilament, myofibril
4Sarcoplasmic reticulum is
- Aa system of transverse tubules that extend at a right angle to the long axis of the cell
- Ba segment of the myofibril between two successive Z lines
- Ca unique name for the plasma membrane of a muscle fiber
- Dnone of the above
5Which of the following are myofilament proteins?
- Atroponin
- Btropomyosin
- Cmyosin
6The contractile unit of a myofibril is the
- Asarcomere
- Btriad
- Csarcolemma
- Dcross-bridge
7The chief function of the T tubule is to
- Aprovide nutrients to the muscle fiber
- Ballow the fiber to contract
- Callow the electrical signal to move deep into the cell
- Dallow the generation of new muscle fibers
8Myosin heads are also called
- Across-bridges
- Bmotor endplates
- Csynapses
- Dmotor neurons
9During muscle contraction, Ca++ is released from the
- Asynapse cleft
- Bmitochondria
- Csarcoplasmic reticulum
- Dsarcoplasm
10The region of a muscle fiber where a motor neuron connects to the muscle fiber is called the
- Asynaptic vesicle
- Bmotor endplate
- CH band
- Dnone of the above
11The thick myofilaments is made up of myosin.
- AVerdadero
- BFalso
12Skeletal muscle has a poor ability to stretch.
- AVerdadero
- BFalso
13A T tubule sandwiched between sacs of sarcoplasmic reticulum is called a codon.
- AVerdadero
- BFalso
14Actin, troponin, and trop0myosin are present on the thin myofilament.
- AVerdadero
- BFalso
15The I band resides within a single sarcomere.
- AVerdadero
- BFalso
16Rigor mortis is caused by a lack of ATP to "turn off" muscle contraction.
- AVerdadero
- BFalso
17The cell membrane of a muscle fiber is called the sarcoplasmic reticulum.
- AVerdadero
- BFalso
18Anaerobic respiration is the first choice of the muscle cell for the production of ATP.
- AVerdadero
- BFalso
19During rest, excess oxygen molecules in the sarcoplasm are attracted to a large protein molecule called myoglobin.
- AVerdadero
- BFalso
20Anaerobic respiration results in the formation of an incompletely catabolized molecule called lactic acid.
- AVerdadero
- BFalso
21The principal component(s) of a motor unit is/are:
- Aa. one somatic motor neuron
- Bb. the muscle fibers supplied by a somatic motor neuron
- Cc. none of the above
- Dd. both a and b
22The staircase phenomenon is also known as
- Atetanus
- Belectromyography
- Cwave summation
- Dtreppe
23Skeletal muscles are innervated by
- Aa. somatic motor neurons
- Bb. autonomic motor neurons
- Cc. both a and b
- Dd. internal stimulation
24Which of the following statements concerning isometric contractions is true?
- AThe length of the muscle changes
- BMuscle tension decreases
- CJoint movements are swift
- DMuscle length remain constant
25Physiologic muscle fatigue is caused by
- Arelative lack of ATP
- Boxygen debt
- Clack of will
- Dnone of the above
26Increase in muscle size is called
- Ahyperplasia
- Batrophy
- Chypertrophy
- Dtreppe
27Endurance training is also called
- Aisometrics
- Bhypertrophy
- Caerobic training
- Danaerobic training
28A muscle contracts the instant it is stimulated.
- AVerdadero
- BFalso
29Isotonic contraction is one in which the tone or tension within a muscle remains the same, but the length of the muscle changes.
- AVerdadero
- BFalso
30One method of studying muscle contraction is called myography.
- AVerdadero
- BFalso
31Muscles with more tone than normal are described as flaccid.
- AVerdadero
- BFalso
32cardiac muscle tissue: [blank_start]striated[blank_end], [blank_start]contains a single nucleus[blank_end], [blank_start]large-diameter T tubules forming diads[blank_end], [blank_start]intercalated disks[blank_end]
skeletal muscle tissue: [blank_start]contains many nuclei near the sarcolemma[blank_end], [blank_start]voluntary[blank_end], [blank_start]movement of bones[blank_end], [blank_start]heat production[blank_end], [blank_start]posture[blank_end]
smooth muscle tissue: [blank_start]located in the walls of hollow organs[blank_end], [blank_start]not striated[blank_end], [blank_start]peristalsis[blank_end], [blank_start]loosely organized SR[blank_end]- Acontains a single nucleus
- Bintercalated disks
- Clarge-diameter T tubules forming diads
- Dstriated
- Econtains many nuclei near the sarcolemma
- Fheat production
- Gmovement of bones
- Hposture
- Ivoluntary
- Jlocated in the walls of hollow organs
- Kloosely organized SR
- Lnot striated
- Mperistalsis
33When a muscle does not shorten and no movement results, the contraction is
- Aisometric
- Bisotonic
- Ctwitch
- Dtetanic
34Pushing against a wall is an example of which type of contraction?
- Aisotonic
- Bisometric
- Ctwitch
- Dtetanic
35Prolonged inactivity causes muscles to shrink in mass, a condition called
- Ahypertrophy
- Bdisuse atrophy
- Cparalysis
- Dmuscle fatigue
36Which statements is true of smooth muscle?
- AIt lines the walls of many hollow organs
- BIt is striated
- CIt is voluntary
- DThere are many T tubules throughout smooth muscle
37What is a quick, jerky response of a given muscle to a single stimulus called?
- Aisometric
- Blockjaw
- Ctetanus
- Dtwitch
38The energy repaired for muscular contraction is obtained by hydrolysis of amino acids.
- AVerdadero
- BFalso
39A motor neuron together with the cells it innervates is called a motor unit.
- AVerdadero
- BFalso
40If muscle cells are stimulated repeatedly without adequate periods of rest, the strength of the muscle contraction will decrease resulting in fatigue.
- AVerdadero
- BFalso
41The minimum level of stimulation required to cause a fiber to contract is called the threshold stimulus.
- AVerdadero
- BFalso
42Weakness of abdominal muscles can lead to a hernia.
- AVerdadero
- BFalso
43There are two types of smooth muscle visceral and multiunit.
- AVerdadero
- BFalso
44Cardiac muscle is also known as striated involuntary.
- AVerdadero
- BFalso
45The length/tension relationship states that the maximal strength a muscle can develop is related to the length of the fibers.
- AVerdadero
- BFalso
46Skeletal muscles have little effect on body temperature.
- AVerdadero
- BFalso
Información
- Descripción
- Study Guide: Muscle Contraction
- Autor
- Alexandra Bozan
- Idioma
- English
- Visitas
- 85
- Etiquetas
- Valoración
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