During Normal Exhalation

question 68

Multiple Choice

During normal exhalation,

• A)the diaphragm relaxes.
• B)the intercostal muscles relax.
• C)the pressure in the lungs increases.
• D)the lung volume decreases.
• E)all of these occur.

---

Definitions:

Acetylcholine

A neurotransmitter in both the peripheral and central nervous systems that is involved in muscle activation, memory formation, and learning.

Neurotransmitter

Chemical messengers that transmit signals across synapses from one neuron to another, facilitating communication within the nervous system.

Voluntary Muscles

Muscles that can be consciously controlled to perform movements, as opposed to involuntary muscles, such as those in the heart or digestive system.

Agonist

An agonist is a chemical or drug that binds to receptors in the brain and activates them, often mimicking the action of naturally occurring substances.