keywords:
Bookmark and Share



Front Back
The connective tissue coverins of a skeletal muscle, listed from superficial to deep, are A) endomysium, perimysium, & epimysium B) endomysium, epimysiu, & perimysium C) epimysium, endomysium, & perimysium D) epimysium, perimysium, & endoysium
D) epimysium, perimysium, & endomysium
The command to contract is distributed deep into a muscle fibr by the A) sarcolema B) sarcomere C) transverse tubules D) myotubules E) myofibrils
C) transverse tubule
The detachment of the myosin cross-bridges is directly triggered by A) the repolarization of Ttubules B) the attachment of ATP to myosin heads C) the hydrolysis of ATP D) calcium ions
C) the hydrolysis of ATP
A muscle producing near-peak tension during rapid cycles of contraction & relaxtion is said to be in A) incomplete tetanus B) treppe C) complete tetanus D) a twitch
A) incomplete tetanus
Which of the following statements about myofibrils in NOT correct? A) each skeletal muscle fiber contains hundreds to thousands of myofibrils B) myofibrils contain repeating units called sarcomeres C) myofibrils extend the length of a skeletal muscle fiber D) filaments consist of bundles of myofibrils E) myofibrils are attached to the plasma membrane at both ends of a muscle fiber
D) filaments consist of bundles of myofibrils
An action poential can travel quickly from one cardiac muscle cell to another because of the pressence of A) gap junctions B) tight junctions C) intercalated discs D) both A & C
D) both A & C
The _____________ contains vesicles filled with acetylchine. A) synaptic terminal B) motor end plate C) neuromusclar junction D) synaptic cleft E) transverse tubule
A) synaptic terminal
An activity that would require anaerobic endurance is A) a 50-meter dash B) a pole vault C) a weight-lifting competition D) all of these
D) all of these
According to the length-tension relationship A) longer muscles can generate more tension than shorter muscles B) the greater the zone of overlap in the sarcomeres, the greater the tension the mmuscle can develop C) the greatest tension is achieved in sarcomeres where actic & myosin initially do not overlap D) there is an optimum range of actin & myosin overlap that will produce the greatest amount of tension E) both B & D
E) both B & D
Which of the following activites would employ isometric contractions? A) flexing the elbow B) chewing food C) maintaining an upright posture D) running E) writing
C) maintaining an upright posture
Skeletal muscle is NOT involved in: A) movement of skin B) propulsion of a substance through a body tube C) heat production D) inhibition of body movement
B) propulsion of a substance through a body tube
Which of the following are part of a thin myofilament? A) ATP-binding site B) regulatory proteins C) globular actin D) calcium
C & b
Transmission of the stimulus at the neuromuscular junction involves: A) synaptic B) sarcolemma C) ACh D) axon terminal
A, B, C, & D
Which of the following activities depends most on anaerobic metabolism? A) jogging B) swimming C) sprinting D) running a marathon
C) sprinting
The first energy source used to regenerate ATP when muscles are extremely active is A) fatty acids B) glucose C) creatine phosphate D) pyruvic acid
C) creatine phosphate
Connective tissue surrounding a fascicle
perimysium
connective tissue ensheathing the entire muscle
epimysium
contractile unit of muscle
sarcoplasm
a muscle cell
fiber
thin connective tissue investing each muscle cell
enomysium
plasma memrane of the muscle cell
sarcolemma
A long, filamentousorganelle found within muscle cells that has a banded appearance
myofibril
actin-or-myosin-containing structure
myofilament
cordlike extension of connective tissue beyond the muscle, serving to attach it to the bone
tendon
a discrete bundle of muscle cells
fascicle
Place in order 1) Acetylcholine is released into the neuromuscular junction by the axonal terminal 2) The action potential, carried deep into the cell, causes the sarcoplasmic reticulum to release calcium ions 3) The muscle cell relaxes & lengthens 4) Acetylcholine diffuses across the neuomuscular junction & binds to receptors on the sarcolemma 5) Thecalcium ions concentration at the myoflilaments increase; the myofilaments slide past one another, & the cell shortens 6) Depolarization occurs, & the action potential is generated 7) As calcium is actively reabsorbed into the sarcoplasmic reticulum, its concentration at the myofilaments decreases
1, 4, 7, 2, 5, 3 & 6
A motor neuron & all of the skeletal muscle cells it stimulates is called a?
motor unit
The axon of each motor neuron has numerous endings called?
axonal terminals
The actual gap betweenan axonal ending & muscle cell is called a
synaptic cleft
Within the axonal endings are many small vesicles containing a neurotransmitter substance called ?
acetylcholine
When the __________ reaches the ends of the axon, the neurotransmitter is released, & it diffuses to the muscle cell membrane to combine with receptors there. Binding of the neurotransmitters with muscle membrane receptors causes the membrane to become permeable to sodium, resulting in the influx of sodium ions & ____________ of the membrane. Then contraction of the muscle cells occurs.
nerve impulse (or action potential), depolarization
Accompanied by lactic acid formation A) coupled reaction of creatine phosphate (CP) & ADP B) anaerobice gycolysis C) aerobic respiration
B) anaerobice gycolysis
Supplies the highest ATP yield per glucose molecule A) coupled reaction of creatine phosphate (CP) & ADP B) anaerobice gycolysis C) aerobic respiration
C) aerobic respiration
Involves the simple transfer of a phosphate group A) coupled reaction of creatine phosphate (CP) & ADP B) anaerobice gycolysis C) aerobic respiration
A) coupled reaction of creatine phosphate (CP) & ADP
Requires no oxygen A) coupled reaction of creatine phosphate (Cp) & ADP B) anaerobice gycolysis C) aerobic respiration
A & B
The slowest ATpregeneration process A) coupled reaction of creatine phosphate (CP) & ADP B) anaerobic gycolysis C) aerobic respiration
C)aerobic respiration
Produces carbon dioxide & water A) coupled reaction of creatine phosphate (CP) & ADP B) anaerobice gycolysis C) aerobic respiration
C) aerobic respiration
The energy mechanism used in the second hoir of running in a marathon A) coupled reaction of creatine phosphate (CP) & ADP B) anaerobice gycolysis C) aerobic respiration
C) aerobic respiration
Good for a sprint A) coupled reaction of creatine phosphate (CP) & ADP B) anarobice gycolysis C) aerobic respiration
A) Coupled reaction ofcreatine phosphate (CP) & ADP
List the 3 types of muscle tissue in the body.
1. skeletal muscle 2. cardiac muscle 3. smooth muscle
What 3 layers of connective tissue are part of each muscle? What functional role does each layer play?
A) epimysium: surrounds entire muscle B) perimysium: surrounds muscle bundles (fascicles) C) endomysium: surrounds skeletal muscle fibers
What structural feature of a skeletal muscle fiber is responsible for conducting action potentials into the interior of the cell?
the transverse tubules (T-tubules) conduct action potentials into the interior of the cell
What 5 interlocking steps are involved in the contraction process?
A) exposure of active sites B) attachment of cross-bridge C) pivoting of myosin heads (power stroke) D) detachment of cross-bridges E) activation of myosin heads (cocking)
What 2 factors affect the amount of tension produced when a skeletal muscle contracts?
both the frequency of motor units stimulation & the number of motor units involved affect the amount of tension produced when a skeletal muscle contracts
What forms of energy reserves do resting skeletal muscle fibers contain?
Resting skeletal muscles fibers contain ATP, cratine phosphate, & glycogen
What 2 mechanisms are used to generate ATP from glucose in muscle cells?
aerobic metabolism & glycolysis generated ATP from glucouse in muscle cells
How does cardiac muscle tissue contract without neural stimulation?
The timing of cardiac muscle contractions is determined by specialized muscle fibers called pacemaker cells; this property of cardiac muscle tissue is termed automaticity
Used when the oxygen supply is inadequate over time A) coupled reaction of creatine phosphate (CP) & ADP B) anaerobice gycolysis C) aerobic respiration
B) anaerobice gycolysis
x of y cards Next >|