the function of the nervous system cell-to-cell communication
while the function of the endocrine system is to regulate
hormones.

The endocrine system uses chemical signals and receptors to
facilitate cell-to-cell communication while the nervous system
doesn’t.

The signalling done by the nervous system is much faster and
specific than that of the endocrine system.

All of the above are true.

None of the above is true.

is not large enough to keep up with the oxygen demands of the
human body.

is not too important since gas exchange (moving oxygen into the
blood and carbon dioxide out of the blood), takes place only in the
trachea.

is about the same size as that of a human’s skin.

is very large because of all of the millions of little air sacs,
called alveoli, which make up the lungs.

is about the same size as a ten football fields.

to allow gas exchange between the environment and our
bodies.

to put carbon dioxide into the blood.

to take oxygen out of the blood.

to breathe in air in order to help cool our bodies.

gets larger; inhale

gets larger; exhale

gets smaller; inhale

doesn’t change size; exhale

gets smaller; exhale

Air consists mostly of oxygen.

The concentration of carbon dioxide in the air is larger than in
the blood, which causes carbon dioxide to move from the alveoli to
the blood.

The reason that our lungs expand when we breathe is because air
is coming into them.

As the volume of a chest cavity increases, the pressure within
it decreases.

When we inhale, the path that air follows is: the nasal cavity,
bronchi, larynx, trachea, sinuses, and finally the alveoli.

The nucleus of a neuron is found in the synaptic terminal.

The purpose of the dendrites of a neuron is to release a
chemical signal if the axon sends an electrical impulse.

The chemical signals released by neurons are called
hormones.

There are only two basic types of neurons: sensory neurons
(which detect stimuli) and motor neurons (which communicate with
muscles).

The axon of a neuron transmits an electrical impulse to the
synaptic terminal.