How can we help?
You can also find more resources in our
Select a category
Something is confusing
Something is broken
I have a suggestion
What is your email?
What is 1 + 3?
HCA Apologia General Science - Module 16
Nerve cells composed of dendrites and axons.
The point at which a signal from one neuron is passed to another neuron.
Cells that support the neurons and help communicate with one another.
Conduct electrical signals TOWARDS the cell body.
Conduct electrical signals AWAY from the cell body.
Bundles of axons that carry signals to and from the brain.
Central nervous system
(CNS) Composed of the brain and the spinal cord. This is the part of the nervous system that does most of the information processing.
Peripheral nervous system
(PNS) Contains all the neurons involved in receiving information and sending it on to the spinal cord and brain.
Deals with the "higher-level" brain functions. These would include interpreting signals, learning, reasoning, and memory.
Composed almost exclusively of the cell bodies of neurons.
Allows the two hemispheres of the brain to exchange information.
Has many functions mostly oriented around muscle movements.
It controls the more basic functions of the human body, such as breathing, heart rate, and the pressure at which blood is pumped through the body.
Autonomic nervous system
The system of nerves which carries instructions from the CNS to the body's smooth muscles, cardiac muscle, and glands.
Sensory nervous system
The system of nerves which carries information from the body's receptors to the CNS.
Somatic motor nervous system
The system of nerves which carries instructions from the CNS to the skeletal muscles.
Part of the autonomic nervous system that increases the rate and strength of the heartbeat and raises the blood pressure.
Part of the autonomic nervous system that slows the heart rate and lowers the blood pressure.
Tiny "bumps" you see on your tongue.
Identify sweet, sour, bitter, salty and umami.
Where light first passes through in the eye; covered with a thin layer of clear tissue that is kept moist and clean.
What the eye uses to focus the image.
The part of the eye on which an image is focused
A smooth muscle that changes the shape of the lens in order to adjust the focus.
A thin sheet of tissue that vibrates as the result of vibrations in the ear.
Tiny bones in the middle ear that move back and forth as a result of the ear drum vibrating.
Snail-like shape that responds to the vibration of the ossicles by transforming it into electrical signal and sending it on to the brain to be interpreted as sound.
Roof of the nasal cavity
Rods and cones
Cells on the retina that are sensitive to light
Attached to the lens of the eye
The nerve leading from the eye to the brain
Olfactory sensory cells
Cells with "hair" in the nose that interact with chemicals that dissolve in the mucus