Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
40 Cards in this Set
- Front
- Back
|
Which of the following is the most immediate source of energy for muscle contraction?
|
d. stored ATP
|
|
|
The "charge" or voltage difference at the Motor End Plate is known as?
|
*e. end-plate potential
|
|
|
Per glucose molecule, how many net ATP's are produced by the typical anaerobic respiration processes in humans?
|
*e. 2
|
|
|
What is the more immediate effect upon the arrival of the action potential at the distal end of the motor neuron's axon ?
|
*d. oppening of calcium channels
|
|
|
For light to moderate exercising that lasts for more than 10 minutes, how much of the muscles ATP is produced by the aerobic respiration route?
|
*a. 90%
|
|
|
What is the source of phosphate for the creatine kinase ?
|
*a. creatine phosphate
|
|
|
Several G actin molecules combined into a long chain?
|
*a. F actin
|
|
|
Name the phase of a muscle twitch for which the stimulation (AP) first arrives and tension just begins, but no contraction is seen?
|
b. latent
|
|
|
Which group of proteins is mutated in the disease marked by muscular atrophy and weakening?
|
*a. dystrophins
|
|
|
Which of the following describes the slow oxidative muscles ?
|
*e. utilize aerobic respiration
|
|
|
The area where nerves meet nerve or nerves meet muscle?
|
*a. synapse
|
|
|
What molecule covers the active sites of actin
|
a. tropomyosin
|
|
|
Which of the following best describes the function of the sarcoplasmic reticulum?
|
*e. to store calcium ions
|
|
|
A disease in which antibodies are produced against the receptors for the neurotransmitter at the neuromuscular junction ?
|
*c. myasthenia gravis
|
|
|
What structure attaches muscle to bone?
|
*c. tendon
|
|
|
What structures mark the ends of the sarcomere
|
*a. z line
|
|
|
A type of contraction in which the muscle lengthens as tension is evenly maintained ?
|
*d. eccentric isotonic contraction
|
|
|
Which of the is a major cause of muscular fatigue?
|
*d. altered electrochemical gradient due to sodium pump disruption
|
|
|
A toxin, used in poison arrows and as a medical anesthetic, which locks the neurotransmitter receptors at the neuromuscular junction?
|
d. curare
|
|
|
What is the function of the myosin light chain kinase ?
|
*c. transfers a phosphate group from ADP to myosin during smooth muscle contraction
|
|
|
The ability to receive and respond to stimuli is known as?
|
b. responsiveness or excitability
|
|
|
Which of the following processes directly requires ATP?
|
*b. to allow the myosin head to release the active site on actin
|
|
|
An immature muscle cell is known as?
|
*b. myoblast
|
|
|
What event allows the binding of the myosin heads to the active sites on actin?
|
*c. active sites are exposed when tropomyosin moves away
|
|
|
What is caused by the rapid influx of sodium into the muscle cell at the neuromuscular junction?
|
*a. an action potential is generated in the muscle cell
|
|
|
Which of the following statements is true for muscles that demonstrate very fine control?
|
*b. they have small motor units
|
|
|
Which of the following best demonstrates the mechanism by which botulism causes disease?
|
*c. blocking or inhibiting calcium channels of the alpha motor neuron
|
|
|
What is the mechanism of action for poliomyelitis
|
a. destruction of motor areas of spinal cord
|
|
|
Where is the concentration of potassium greatest, “inside” the cell or “outside”?
|
*d. inside
|
|
|
A process in which the force of contraction (tension) in a a muscle is increased by stimulating more and more motor units, rather than increasing the frequency of stimuli?
|
*d. multiple motor unit summation
|
|
|
A muscle type that is typified as being striated ?
|
a. skeletal
|
|
|
Give one diagnostic feature (what is unique about its appearance, no other muscle type shares this feature) for smooth muscle?
|
c. spindle-shaped
|
|
|
Another name for the Elastic Filament of a muscle cell's sarcomere?
|
*b. titin
|
|
|
The wasting away of a structure such as a muscle is known as ?
|
*a. atrophy
|
|
|
Which of the following describes the fast glycolytic muscles ?
|
a. reduction in capillaries
|
|
|
Which of the following inhibits the activity of the neurotransmitter at the neuromuscular junction ?
|
*a. acetylcholinesteras
|
|
|
A connective tissue covering of the muscle (deep to the fascia)?
|
*d. epimysium
|
|
|
Which of the following is caused by strychnine poisoning?
|
*b. spastic paralysis
|
|
|
A muscle type that uses intracellular calcium?
|
*e. skeletal
|
|
|
How much of a muscles acquired energy actually produces "work"?
|
*c. 40
|
