Section 1
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Active muscles generate
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Last updated
7 years ago
Date created
Mar 1, 2020
Cards (64)
Section 1
(50 cards)
Active muscles generate
carbon dioxide and heat
Place these steps of muscle contraction in correct order 1. Action potential is generated alone the sarcolemma 2. nerve impulse arrives at synapse 3. Calcium is released into muscle cell cytoplasm 4. Acetylcholine is produced 5. Actin and myosin molecules continuously cross-link with actin molecules being pulled inward
2,4,1,3,5
the difference in the action when comparing the biceps brachii to the flexor carpi raidialis, is
One muscle flexes the hand at the wrist and the other flexes the entire forearm
Upon the nerve impulse arriving at the axon terminal
Acetylcholine is released
The term used to describe muscular growth in the response to usage is
Hypertrophy
Tropomyosin strands are held in position by which of the following?
Troponin molecules
Acetylcholinesterase is found within the
synaptic cleft
Which of the following occurs when tension production rises to a peak and very brief periods of relaxation occur ?
Incomplete tetanus
Which of these units contains overlapping actin and myosin myofilaments ?
A band
A resting muscle generates most of its ATP by
aerobic respiration
Which of these locations has the ability to breakdown ATP, which released energy ?
Head of myosin molecule
Regarding lactic acid regulation, which cells in the body consume extra oxygen and produce ATP for the conversion of excess lactate absorbed from the blood back to glucose ?
Liver cells
Botulism
Results from a bacterial toxin that prevents the release of acetylcholine at the axon terminals
The heart to be able to regulate its contractions heart muscle, unlike skeletal muscle cannot go into a tetanus. This is because
The heart muscle has to be able to consistently contract and pump blood in a controlled fashion
During activities requiring aerobic endurance
Most of the muscles energy is produced in the mitochondria
which of the following is an effect of aging on the muscular system
Skeletal muscle fibers become smaller in diameter
Which of these regions shorten(s) during skeletal muscle contraction?
both B and C ( I band and H zone)
Which of these units contains the Z line ?
I band
the stiffness that occurs at death, when actin and myosin molecules stay linked to each other in contracted state is due to lack of
ATP
a single stimulus-contraction-relaxation sequence in a muscle fiber is known as a(n)
Twitch
A person whose genetic makeup makes him or her a better marathon runner than a sprinter probably has more ________ in his or her leg muscles.
slow fibers
Creatine phosphate serves to
supply energy to synthesize ATP
Muscle cells
can only contract
the skeletal muscles store calcium ions in the terminal cisternae of the
sarcoplasmic reticulum
Which Statement Regarding Skeletal muscle is true?
Skeletal muscles contain blood Vessels
which of the following is one of the steps that end a contraction?
Acetylcholine is broken down by acetylcholinesterase
"Anaerobic Endurance"
is exemplified by contractions of fast muscle fibers
neurotransmitters that cause skeletal muscle contraction are normally stored in
Motor neuron axon terminals
during contraction, muscles shorten ________ ,and lengthen _______.
Forcefully, passively
Myofibrils are made primarily of
actin and myosin
which statement regarding isometric contractions is true ?
the tension produced never exceeds the load
Calcium ions are released from the sarcoplasmic reticulum during the ________ phase of contraction
Latent
which of these is NOT a part of the actin myofilament
Cisternae
What is the function of the transverse tubules ?
transmit muscle impulses into the cell interior.
The specialized specialized sarcolemma that contains acetylcholine receptors is the
motor end plate
Why do individual muscle twitches have to be added together, as in summation or Tetanus?
Multiple twitches add up to an increase in muscle fiber tension, which increases the strength of the muscle
The area of the sarcomere that is the light region between two successive A-bands is the
I band
Tom is having difficulty dorsiflexing and inverting his right foot. Which muscle is most likely involved in this problem?
Tibialis Anterior
Exhaustion of energy reserves decline in PH due to production and dissociation of lactic acid causes
muscle fatigue
The connective tissue that covers each muscle fiber
endomysium
During moderate activity which of the following is true regarding muscle metabolism ?
GLucose and fatty acids are catabolized
In response to actin arriving from the transverse tubules, the sarcoplasmic reticulum releases
Calcium Ions
The additional oxygen required during the recovery period to restore the normal pre-exertion levels is called the
Oxygen Debt
Which of the following terms is a descriptive word for a muscle's action?
Adductor
which statement regarding "heat loss" is true
Muscle contractions play an important role in the maintenance of normal body temperature
Muscle cells that are cylindrical and branched, each with a single, centrally located nucleus, and that contract spontaneously are
cardiac muscle
which of the following statements describes how muscles help maintain homeostasis?
skeletal muscle contractions help maintain body temperature
Troponin binds to
all of these
Which of the following occurs when glycolysis produces pyruvate faster than it can be used by the mitochondria ?
Lactic acid is produced
each muscle cell is a
fiber
Section 2
(14 cards)