Practical 2 - Connect Images Flashcards
(77 cards)
Locate:
Nucleus of Skeletal Muscle Fiber
Locate:
Skeletal Muscle Fiber
Locate:
Branched Cardiac Muscle Fiber
Locate:
Intercalated Disc
Locate:
Nucleus of Cardiac Muscle Fiber
Locate:
Longitudinal Smooth Muscle Fiber
Locate:
Smooth Muscle Fiber
Locate:
Nucleus of Smooth Muscle Fiber
Locate:
Smooth Muscle Fiber
Locate:
Axon of Motor Neuron
Locate:
Motor End Plate
Locate:
Skeletal Muscle Fiber
LOOK AT IMAGE: Correctly label the following parts of a motor unit.
- Skeletal Muscle Fibers
- Spinal Cord
- Neuromuscular Junction
A motor unit is composed of
a. one motor neuron and one whole muscle.
b. several motor neurons and several muscle fibers.
c. one motor neuron and all of the muscle fibers it innervates.
one motor neuron and all of the muscle fibers it innervates.
Motor unit recruitment is the __________ of motor units to __________ the overall contraction strength of a muscle.
a. addition; decrease
b. addition; increase
c. subtraction; increase
d. subtraction; decrease
addition; increase
The major electrical activity measured by an EMG (electromyogram) is generated by
a. skeletal muscle only.
b. skeletal and smooth muscles only.
c. any type of muscle.
d. cardiac muscle only.
skeletal muscle only.
The electromyogram (EMG) mainly reflects
a. tension in the contracting muscle.
b. action potentials from the contracting muscle fibers.
c. action potentials from the motor neurons.
d. the movement of the contracting muscle.
action potentials from the contracting muscle fibers.
What is the relationship between electrical activity of a muscle and greater grip strength?
a. Electrical activity is independent of grip strength, meaning grip strength and electrical activity are not related.
b. They are indirectly related, meaning more grip strength produces less electrical activity.
c. They are directly related, meaning more grip strength produces more electrical activity.
They are directly related, meaning more grip strength produces more electrical activity.
CHECK ALL THAT APPLY: When grip strength increases,
a. action potential voltage increases.
b. action potential frequency decreases.
c. action potential frequency increases.
d. the number of active motor units increases.
Action potential frequency increases and the number of active motor units increases.
SELECT ALL THAT occurs when more motor neurons are sending action potentials to the same target muscle:
a. fewer motor units are activated
b. stronger muscle contraction
c. more motor units are active
d. this is called motor unit recruitment
e. each motor unit becomes larger
f. the muscle is less likely to fatigue
b. stronger muscle contraction
c. more motor units are active
d. this is called motor unit recruitment
SELECT ALL THAT an electromyogram can tell us:
a. if there is a potential problem with the nervous system
b. if there is a potential problem with the skeletal muscle system
c. if there is an ionic imbalance affecting muscle contraction
d. if a muscle is fatiguing
If there is a potential problem with the nervous system
AND
If there is a potential problem with the skeletal muscle system
True or False:
An electromyograph (EMG) can record contraction strength.
FALSE
An electromyograph (EMG) records electrical activity (action potentials) in muscles but does not directly measure contraction strength. However, the electrical activity can be correlated with contraction strength.
Locate:
Biceps brachii muscle
Locate:
Deltoid muscle
