The pathway involving $$\text{cAMP}$$

Opening of voltage-gated $$\text{Na}^+$$ channels

Question 1

Which of the following best explains why a cell responds differently to the same hormone as another cell?

Accepted Answer

The cell's receptor type and intracellular signaling pathways determine its response.

Question 2

A patient is given a drug that inhibits adenylyl cyclase. Which second messenger pathway will be directly affected?

Accepted Answer

The pathway involving $$	ext{cAMP}$$

Question 3

Which of the following best describes the amplification process in a signal transduction cascade?

Accepted Answer

A single activated receptor triggers the production of many second messengers.

Question 4

Which statement correctly compares tyrosine kinase receptors and G protein-coupled receptors (GPCRs)?

Accepted Answer

Tyrosine kinase receptors directly phosphorylate proteins, while GPCRs activate second messenger systems.

Question 5

Which hormone class is synthesized on demand, not stored, and transported bound to carrier proteins?

Accepted Answer

Steroid hormones

Question 6

A hormone exhibits permissiveness. What does this mean?

Accepted Answer

It allows another hormone to exert its full effect.

Question 7

Which equation describes the equilibrium potential for an ion, and what is it based on?

Accepted Answer

The Nernst equation: $$E_{ion} = \frac{RT}{zF} \ln \left( \frac{[ion]_{out}}{[ion]_{in}} \right)$$, based on ion concentration gradients and charge.

Question 8

During an action potential, which event is responsible for the rapid depolarization phase?

Accepted Answer

Opening of voltage-gated $$	ext{Na}^+$$ channels

Question 9

A neuron receives a stimulus that causes hyperpolarization. What is the effect on the membrane potential?

Accepted Answer

The membrane potential becomes more negative.

Question 10

Which of the following best describes the coding of stimulus intensity in the nervous system?

Accepted Answer

Stronger stimuli increase the frequency of action potentials.

Question 11

Which lobe of the cerebrum is primarily responsible for processing visual information?

Accepted Answer

Occipital lobe

Question 12

Damage to the thalamus would most likely affect which function?

Accepted Answer

Relay and processing of sensory information

Question 13

Which statement correctly describes the difference between somatic motor neurons and autonomic neurons?

Accepted Answer

Somatic motor neurons innervate skeletal muscle, while autonomic neurons innervate smooth and cardiac muscle.

Question 14

Which neurotransmitter is released by preganglionic neurons in both the sympathetic and parasympathetic divisions of the autonomic nervous system?

Accepted Answer

Acetylcholine

Question 15

Which receptor subtype is found at the neuromuscular junction and mediates fast excitatory responses?

Accepted Answer

Nicotinic acetylcholine receptor

Question 16

A patient with a lesion in the vestibular apparatus would most likely experience which symptom?

Accepted Answer

Impaired balance and equilibrium

Question 17

Which process is responsible for the conversion of mechanical sound waves into electrical signals in the ear?

Accepted Answer

Transduction by hair cells in the cochlea

Question 18

Which statement best describes the difference between rods and cones in the retina?

Accepted Answer

Rods are for low-light vision, while cones are responsible for color vision and high acuity.

Question 19

Which equation represents the use of ATP in muscle contraction?

Accepted Answer

ATP hydrolysis: $$	ext{ATP} ightarrow 	ext{ADP} + 	ext{P}_i$$

Human Physiology: Signal Transduction, Endocrinology, Nervous System, Sensory and Muscle Physiology

Study Guide - Practice Questions