Question 1

Which of the following is NOT a form of local communication used in the body?

Accepted Answer

Endocrine signaling

Question 2

A signal amplification cascade in a cell results in:

Accepted Answer

A single signaling molecule triggering the activation of many downstream molecules

Question 3

Which of the following best describes the function of calcium ($$Ca^{2+}) as an $$intracellular messenger?

Accepted Answer

It acts as a second messenger, activating proteins and enzymes within the cell

Question 4

Which step is NOT part of the chemical synapse process?

Accepted Answer

Direct electrical conduction through gap junctions

Question 5

Which of the following is TRUE regarding the difference between graded potentials and action potentials?

Accepted Answer

Action potentials are 'all-or-nothing', while graded potentials vary in amplitude

Question 6

What is the primary role of the G protein-coupled receptor (GPCR)-phospholipase C signal transduction pathway?

Accepted Answer

To generate second messengers such as $$IP_3$$ and $$DAG$$ that regulate cellular responses

Question 7

Which statement about the blood-brain barrier is correct?

Accepted Answer

It is formed by tight junctions between endothelial cells and restricts passage of many substances

Question 8

Which of the following best describes the concept of 'synergism' in hormone interactions?

Accepted Answer

Two hormones together produce a greater effect than the sum of their individual effects

Question 9

Which equation correctly represents the Nernst equation for calculating the equilibrium potential of an ion?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[ion]_{out}}{[ion]_{in}} \right)$$

Question 10

A patient is unable to form new long-term memories but can recall events from childhood. Which type of memory is most likely affected?

Accepted Answer

Declarative memory

Question 11

Which of the following is a correct sequence of events during an action potential?

Accepted Answer

Depolarization, repolarization, hyperpolarization

Question 12

Which neurotransmitter is terminated by reuptake into the presynaptic neuron?

Accepted Answer

Serotonin

Question 13

Which of the following is TRUE about the hypothalamus?

Accepted Answer

It regulates homeostasis and controls the pituitary gland

Question 14

Which hormone is synthesized as a preprohormone and then processed before secretion?

Accepted Answer

Insulin

Question 15

Which of the following is an example of a simple endocrine reflex?

Accepted Answer

Insulin release in response to increased blood glucose

Question 16

Which of the following best describes the role of the limbic system?

Accepted Answer

Processing emotions and memory

Question 17

Which statement about the cerebral cortex is correct?

Accepted Answer

It is divided into lobes that specialize in different functions such as sensory, motor, and association

Question 18

Which of the following is a correct example of 'antagonism' in hormone interactions?

Accepted Answer

Insulin and glucagon regulating blood glucose levels

Question 19

Which process is responsible for the termination of neurotransmitter action at a synapse?

Accepted Answer

All of the above

Question 20

Which of the following is TRUE regarding the role of the myelin sheath?

Accepted Answer

It enables saltatory conduction, allowing action potentials to jump between nodes of Ranvier

Study Notes: Communication, Integration, Homeostasis, and the Nervous System

Study Guide - Practice Questions