Exam 3 Practice Questions Flashcards
Alpha blockers and beta blockers are antagonists to what kind of receptor? And what kind of ANS pathway does this affect?
It blocks adrenergic receptors which affects the sympathetic pathway
If a neuron releases norepinephrine, it is a part of which division of the peripheral nervous system?
A) Sensory
B) Somatic motor
C) Sympathetic
D) Afferent
E) Parasympathetic
C) Sympathetic
The receptor found on most parasympathetic target cells is
A) muscarinic cholinergic
B) nicotinic cholinergic
C) alpha adrenergic
D) beta adrenergic
A) Musacarinic cholinergic
Select all that apply
The sympathetic nervous system originates in the ___________ regions (s) of the spinal cord
a) cervical
b) sacral
c) lumbar
d) thoracic
c) lumbar
d) thoracic
Select all that apply
The parasympathetic nervous system has:
a) long preganglionic and short postganglionic nerve fibers
b) short preganglionic neurons and long postganglionic nerve fibers
c) no synapses between the central nervous system and the innervated organs
a) long preganglionic and short postganglionic nerve fibers
Select all that apply:
Ganglia contain cell bodies of:
a) somatic motor neurons
b) preganglionic autonomic neurons
c) postganglionic autonomic neurons
d) sensory neurons
c) postganglionic autonomic neurons
d) sensory neurons
Select all that apply:
If a person’s vagus nerve was cut in an accident, that person is likely to experience
a) increase heart rate
b) tingling sensation in their fingertips
c) impaired digestion
d) excessive sweating
a) increase heart rate
c) impaired digestion
Finish the sentence:
The motor end plate is:
a) the axon terminal of a somatic motor neuron
b) the docking site for Ach vesicles
c) where the somatic neuron exits the spinal cord
d) the location of nicotinic Ach receptors on skeletal muscle fibers
d) the location of nicotinic Ach receptors on skeletal muscle fibers
Select all that apply:
Which characteristic differentiates skeletal muscle from both cardiac and smooth muscle?
a) multinucleated fibers
b) is striated
c) can generate force
d) stimulated by somatic motor neurons
a) multinucleated fibers
d) stimulated by somatic motor neurons
During exercise, blood flow shifts from the GI tract to skeletal muscle as a result of increased oxygen demand. Which muscle type is mainly responsible for redirecting the blood flow? Or in other words which muscle type makes up blood vessels?
a) smooth
b) skeletal
c) cardiac
d) it is not muscle that is redirecting the blood flow
a) smooth
Which allows action potentials to move rapidly from the cell surface into the interior?
a) terminal cisternae
b) fasicles
c) t-tubules
d) crossbridges
e) sarcoplasmic reticulum
c) t-tubules
Select all that apply:
Why does rigor mortis occur after death?
a) there is no ATP available to bind to myosin
b) body temperature drops
c) connective tissue around the muscle fasicle hardens
d) myosin is tightly bound to actin
a) there is no ATP available to bind to myosin
d) myosin is tightly bound to actin
Which is NOT though to play a role in muscle fatigue during normal exercise?
a) muscle glycogen depletion
b) decreased neurotransmitter activity
c) increased P
d) locally elevated ECF K+
e) all of them play a role in muscle fatigue
e) all of them play a role in muscle fatigue
Select all that apply
How do the skeletal muscle fibers in the legs of a marathon runner differ from those of a sprinter who runs the 100-meter dash?
a) longer and thinner muscle fibers
b) mostly slow oxidative fibers
c) higher mitochondrial content
d) less likely to fatigue
All of them!
Your dog gets excited when he watches you open the closet that contains his leash. This is an example of which kind of reflex?
a) innate
b) autonomic
c) learned
d) cranial
e) somatic
c) learned
Select all that apply
Which statement is true?
a) visceral reflexes are controlled by autonomic neurons
b) spinal reflexes do not require any input from the brain
c) reflex movements are integrated mainly in the spinal cord
d) cranial reflexes are integrated in the brain
All of them
Select all that apply:
Just before a class presentation, you have butterflies in your stomach and are beginning to blush. Which is true about this response?
a) the limbic system is playing a role
b) these are autonomic reflexes
c) these are polysynaptic reflexes
d) the emotion is being transformed into a visceral function
All of the above
Somatic motor neurons that innervate skeletal muscle fibers are called
a) alpha motor neurons
b) gamma motor neurons
c) intrafusal fibers
d) extrafusal fibers
a) alpha motor neurons
Stretching the muscle spindle causes:
a) reflex inhibition of the muscle
b) stretching of the tendon
c) reflex contraction of the muscle
d) activation of antagonistic muscles
c) reflex contraction of the muscle
Select all that apply
Which is TRUE about muscle spindles?
a) they send out information about muscle length to the CNS
b) they are innervated by gamma motor neurons
c) they contain sensory neurons
d) they are tonically activated
all of them
How are myosin and actin organized within smooth muscle cells?
A) In tightly packed sarcomeres aligned in a striated pattern
B) The proteins are arranged in a net like structure
C) In a random arrangement with no overlap between filaments
D) In parallel bundles attached to Z lines at regular intervals
B
