BIO 102 MODULE SET 3 EXAM
QUESTIONS AND ANSWERS 2026
What are the functions of the three main types of neurons? - ANSWERSSensory
neurons receive information from an organism's external and internal environment and
transmit the information to the brain.
Interneurons are connecting neurons that are usually part of a circuit. Interneurons have
the role of integrating information so that a response can occur.
What are the two main ways neurotransmitters are cleared from the synapse? -
ANSWERSInactivating enzymes and reuptake via neurotransmitter transport channels
Which type of muscle has the main role of contracting and relaxing so that bones can
be moved? - ANSWERSSkeletal
True or False: The thick filaments of a myofibril are composed of actin. -
ANSWERSFalse; The thin filaments are composed of action, while the thick filaments
are composed of myosin
Describe the sliding filament model. - ANSWERSThe sliding filament model occurs
when a muscle contracts but the thick and thin filaments remains the same length while
the muscle shortens. This is because actin and myosin proteins slide past each other
and overlap resulting in an unsized change
Which of the following ions are involved in rigor mortis? - ANSWERSCalcium
Motor neurons are outgoing messengers. Specifically, these neurons transmit
messages from the brain to muscle fibers or glands to elicit a desired response
At what part of the neuron does the cell body meet the axon? - ANSWERSAxon hillock
Describe each stage of an action potential. - ANSWERS(1) Resting phase: During the
resting phase, the gated Na+ and K+ channels are both closed, and the membrane
potential is around -70 mV.
(2) Depolarization: A stimulus arrives at the dendrites (not shown) and causes Na+
channels to open, which allows Na+ ions to flow into the cell down their gradient (from a
high to low concentration). Note that K+ channels remain closed. A depolarization
occurs causing the membrane potential to reach the threshold.
(3) Rising Phase: Positive feedback causes the opening of more Na+ channels, and
Na+ ions flow into the cell, causing a rapid shift in the membrane potential toward a
more positive state. Notice that K+ channels are still closed.
QUESTIONS AND ANSWERS 2026
What are the functions of the three main types of neurons? - ANSWERSSensory
neurons receive information from an organism's external and internal environment and
transmit the information to the brain.
Interneurons are connecting neurons that are usually part of a circuit. Interneurons have
the role of integrating information so that a response can occur.
What are the two main ways neurotransmitters are cleared from the synapse? -
ANSWERSInactivating enzymes and reuptake via neurotransmitter transport channels
Which type of muscle has the main role of contracting and relaxing so that bones can
be moved? - ANSWERSSkeletal
True or False: The thick filaments of a myofibril are composed of actin. -
ANSWERSFalse; The thin filaments are composed of action, while the thick filaments
are composed of myosin
Describe the sliding filament model. - ANSWERSThe sliding filament model occurs
when a muscle contracts but the thick and thin filaments remains the same length while
the muscle shortens. This is because actin and myosin proteins slide past each other
and overlap resulting in an unsized change
Which of the following ions are involved in rigor mortis? - ANSWERSCalcium
Motor neurons are outgoing messengers. Specifically, these neurons transmit
messages from the brain to muscle fibers or glands to elicit a desired response
At what part of the neuron does the cell body meet the axon? - ANSWERSAxon hillock
Describe each stage of an action potential. - ANSWERS(1) Resting phase: During the
resting phase, the gated Na+ and K+ channels are both closed, and the membrane
potential is around -70 mV.
(2) Depolarization: A stimulus arrives at the dendrites (not shown) and causes Na+
channels to open, which allows Na+ ions to flow into the cell down their gradient (from a
high to low concentration). Note that K+ channels remain closed. A depolarization
occurs causing the membrane potential to reach the threshold.
(3) Rising Phase: Positive feedback causes the opening of more Na+ channels, and
Na+ ions flow into the cell, causing a rapid shift in the membrane potential toward a
more positive state. Notice that K+ channels are still closed.
