Lab 1: Latest Update

BIOD152 / BIOD 152 Module 1 &

Lab 1: (Latest Update 2025 / 2026)

Essential Human Anatomy & Physiology II with Lab | Questions & Answers | Grade A | 100% Correct - Portage Learning

Question:

Which of the following is false concerning the sodium-potassium pump?

• It maintains the resting phase of an axon.
• For every three sodium ions pumped out, two potassium ions are pumped

in.

• It must remain in constant operation to maintain the resting state.
• The overall effect is a negative charge on the outside of the membrane.

Answer:

• The overall effect is a negative charge on the outside of the membrane.

(False, the effect of the pump is a negative charge inside the membrane, positive on the outside.) 1 / 3

Question:

True or false: A sensory neuron is signaling the body of extreme pain. This

means that the strength of the action potential is greater than usual. Explain your reasoning.

Answer:

False There is no variation in the strength of action potentials. (It is an all-or- nothing response). # and frequency of neurons only

Question:

Which of the following statements is true concerning the neuromuscular junction?

• The NMJ terminates on neurons within the brain and spinal cord.
• the NMJ terminates on a muscle fiber.
• The NMJ terminates on a presynaptic motor neuron.
• The NMJ does not have a synapse.

Answer:

• the NMJ terminates on a muscle fiber.

• / 3

Question:

How is a message sent from one neuron to another?

Answer:

a synapse, between the axon terminal of the sending neuron and the dendrite of the receiving neuron.

a nerve impulse reaches the end of an axon, neurotransmitters are released into the synapse.

These bind with a receptor on the next neuron, opening Sodium gates in the receiving dendrite which causes depolarization and the impulse is carried.

Question:

What neurotransmitter is found at the neuromuscular junctions?

Answer:

acetylcholine

• / 3