BIO 167 LAB EXAM 2 QUESTIONS AND
ANSWERS
Dorsiflexion or extension of the great toe is expected during the planar reflex
test. - ANSWER false
In which area of the muscle is the signal from the nervous system is transmitted
it? - ANSWER The neuromuscular junction
What reaction is observed during the triceps reflex? - ANSWER Extension of
the elbow
Interneurons are part of the central nervous system and they are involved in
reflex arcs. - ANSWER True
What parts of the neuron transmits the outgoing signal to nearby cells? -
ANSWER Axon terminals
If you were testing the plantar reflex by stroking the lateral aspect of the sole of
the foot in an adult which of the following would be a normal response? -
ANSWER flexion of the toes downward
Which of the following lists the parts of a reflex arc in the correct sequence? -
ANSWER receptor, sensory neuron, interneuron, motor neuron, effector
In the Demonstrate Monosynaptic Reflexes Lab, why do the reflexes occur?
Select all that apply. - ANSWER By triggering the tendon of a muscle you are
initiating the reflex arc.
By triggering stretch receptors in the muscle you are initiating the reflex arc.
By triggering a skin receptor near the muscle you are initiating the reflex arc.
By triggering the muscle effector you are initiating the reflex arc.
The ________ of the reflex hammer is used to tap on tendons or ligaments. -
ANSWER broad flat side
, Which of the following areas can you use the broad flat side of the reflex
hammer to test reflexes? - ANSWER patellar
calcaneal
triceps brachii
In the shoulder elbow movement lab, this muscle is the prime mover for
adduction of the arm at the shoulder joint. - ANSWER pectoralis major
A muscle responsible to assist the movement of the prime mover is a -
ANSWER synergist
In the shoulder elbow movement lab, this muscle is the antagonist for forearm
flexion of the arm at the elbow joint. - ANSWER triceps brachii
The thin myofibril filament of a sarcomere is composed of a protein -
ANSWER actin
The highlighted muscle on the back of the arm in this cadaver is the -
ANSWER triceps brachii.
As the magnitude of stimulation increases, the skeletal muscle will contract with
________ force due to the ________ number of muscle fibers contracting. -
ANSWER increased; increased
In the Shoulder elbow movement lab, this muscle is the prime mover for
forearm flexion of the arm at the elbow joint. - ANSWER brachialis
Skeletal muscles are composed of hundreds of ________, which contain
________. - ANSWER muscle fiber cells; myofibrils
In the Shoulder elbow movement lab, this muscle is the prime mover for
forearm extension of the arm at the elbow joint. - ANSWER triceps brachii
What neurotransmitter is released at the neuromuscular junction when an action
potential arrives at the motor neuron terminal? - ANSWER acetylcholine
(ACh)
ANSWERS
Dorsiflexion or extension of the great toe is expected during the planar reflex
test. - ANSWER false
In which area of the muscle is the signal from the nervous system is transmitted
it? - ANSWER The neuromuscular junction
What reaction is observed during the triceps reflex? - ANSWER Extension of
the elbow
Interneurons are part of the central nervous system and they are involved in
reflex arcs. - ANSWER True
What parts of the neuron transmits the outgoing signal to nearby cells? -
ANSWER Axon terminals
If you were testing the plantar reflex by stroking the lateral aspect of the sole of
the foot in an adult which of the following would be a normal response? -
ANSWER flexion of the toes downward
Which of the following lists the parts of a reflex arc in the correct sequence? -
ANSWER receptor, sensory neuron, interneuron, motor neuron, effector
In the Demonstrate Monosynaptic Reflexes Lab, why do the reflexes occur?
Select all that apply. - ANSWER By triggering the tendon of a muscle you are
initiating the reflex arc.
By triggering stretch receptors in the muscle you are initiating the reflex arc.
By triggering a skin receptor near the muscle you are initiating the reflex arc.
By triggering the muscle effector you are initiating the reflex arc.
The ________ of the reflex hammer is used to tap on tendons or ligaments. -
ANSWER broad flat side
, Which of the following areas can you use the broad flat side of the reflex
hammer to test reflexes? - ANSWER patellar
calcaneal
triceps brachii
In the shoulder elbow movement lab, this muscle is the prime mover for
adduction of the arm at the shoulder joint. - ANSWER pectoralis major
A muscle responsible to assist the movement of the prime mover is a -
ANSWER synergist
In the shoulder elbow movement lab, this muscle is the antagonist for forearm
flexion of the arm at the elbow joint. - ANSWER triceps brachii
The thin myofibril filament of a sarcomere is composed of a protein -
ANSWER actin
The highlighted muscle on the back of the arm in this cadaver is the -
ANSWER triceps brachii.
As the magnitude of stimulation increases, the skeletal muscle will contract with
________ force due to the ________ number of muscle fibers contracting. -
ANSWER increased; increased
In the Shoulder elbow movement lab, this muscle is the prime mover for
forearm flexion of the arm at the elbow joint. - ANSWER brachialis
Skeletal muscles are composed of hundreds of ________, which contain
________. - ANSWER muscle fiber cells; myofibrils
In the Shoulder elbow movement lab, this muscle is the prime mover for
forearm extension of the arm at the elbow joint. - ANSWER triceps brachii
What neurotransmitter is released at the neuromuscular junction when an action
potential arrives at the motor neuron terminal? - ANSWER acetylcholine
(ACh)
