PHYSIOLOGY TEST 4 BIO 253 EXAM
2025/2026 – COMPLETE EXAM
QUESTIONS AND VERIFIED
ANSWERS
What is the correct order for the events that occur during a reflex?
C. Information is processed by interneurons
A Impulse travels through sensory neuron to the CNS
E. Effector responds
B. A stimulus activates a receptor
D. Motor neuron transmits impulse to effector - ANSWERB,A,C,D,E
When a nerve impulse reaches the end bulbs of a neuron - ANSWERcalcium is
released from the neuron along with neurotransmitters from synaptic vesicles.
This portion of the brain secretes the hormone melatonin, which helps to regulate the
body's circadian rhythm. - ANSWERpineal gland
When voltage-gated K+ channels open on the axon of a neuron - ANSWERPotassium
exits, depolarizing the cell to an even more negative value.
A nerve impulse travels fastest along _____ axons in _____ conduction -
ANSWERmyelinated; salutatory
The glial cell that helps to circulate cerebrospinal fluid is the - ANSWEREpendymal
The superior colliculi of the tectum help you respond to - ANSWERvisual stimuli, for
example, when you turn toward a bright flash of light.
Which cranial nerve senses light and which cranial nerve controls the iris
contraction/dilation? - ANSWEROptic; oculomotor
The pupillary reflex can be described as - ANSWERAutonomic; spinal
Hyperpolarization of a neuron at the soma/dendrites can occur when - ANSWERsodium
enters and potassium exits
2025/2026 – COMPLETE EXAM
QUESTIONS AND VERIFIED
ANSWERS
What is the correct order for the events that occur during a reflex?
C. Information is processed by interneurons
A Impulse travels through sensory neuron to the CNS
E. Effector responds
B. A stimulus activates a receptor
D. Motor neuron transmits impulse to effector - ANSWERB,A,C,D,E
When a nerve impulse reaches the end bulbs of a neuron - ANSWERcalcium is
released from the neuron along with neurotransmitters from synaptic vesicles.
This portion of the brain secretes the hormone melatonin, which helps to regulate the
body's circadian rhythm. - ANSWERpineal gland
When voltage-gated K+ channels open on the axon of a neuron - ANSWERPotassium
exits, depolarizing the cell to an even more negative value.
A nerve impulse travels fastest along _____ axons in _____ conduction -
ANSWERmyelinated; salutatory
The glial cell that helps to circulate cerebrospinal fluid is the - ANSWEREpendymal
The superior colliculi of the tectum help you respond to - ANSWERvisual stimuli, for
example, when you turn toward a bright flash of light.
Which cranial nerve senses light and which cranial nerve controls the iris
contraction/dilation? - ANSWEROptic; oculomotor
The pupillary reflex can be described as - ANSWERAutonomic; spinal
Hyperpolarization of a neuron at the soma/dendrites can occur when - ANSWERsodium
enters and potassium exits
