The Nervous System
Part of the nervous system that gathers information from the sensory organs and carries it to the CNS to be processed.
Peripheral nervous system
Used for reasoning, planning, verbal communication, and voluntary body movement.
frontal lobe
Sensory receptors found in tissues throughout the body.
pain receptors
Chemical messengers released by endocrine glands into the bloodstream to affect multiple cells.
hormones
Pigmented, muscular portion of the eye that controls the amount of light that enters.
iris
Two primary types of photoreceptors.
rods and cones
The level of stimulus too weak to cause action potential.
threshold
Provides environmental awareness.
parietal lobe
Five basic taste sensations distinguished by taste hairs.
sweet, sour, bitter, salty, and umami
Endocrine glands which produce epinephrine and norepinephrine.
adrenal glands
The innermost layer of the eye containing neurons.
retina
The transparent covering of the eye.
cornea
The brain and spinal cord together form this system.
Central Nervous System
Controls involuntary respiration, blood pressure, and heart rate.
brain stem
Specialized dendrites of sensory neurons; some are little more than bare dendrites.
sensory receptors
Acts more slowly than neural impulses, but has a long duration.
endocrine hormones
Carries visual information to the brain.
optic nerve
The white of the eye.
sclera
Neurons that carry information about your surroundings to the brain. May detect heat or cold and stimuli cause the action to begin.
sensory neuron
Controls body coordination.
cerebellum
Located between the semicircular canals and the cochlea, these provide a sense of balance.
utricle and the saccule
The organ which produces Insulin and glucagon, regulating blood glucose level.
pancreas
Focuses light entering the eye.
lens
Contains blood vessels that nourish the eye.
choroid
The action potential can cross the synaptic cleft between the axon terminal of one neuron and the dendrite of the next neuron using these.
neurotransmitters
Provides hearing, smell, and memory.
temporal lobe
Receptors stimulated by molecules in the air which are located in the membranes of the nasal cavities.
olfactory receptors
Hormones released by the pituitary gland which stimulate the gonads to produce hormones to start puberty.
gonadotropins
The fluid that provides for the eye.
vitreous humor
Fills the chamber between the lens and the cornea.
aqueous humor
Links the nervous and the endocrine systems.
hypothalamus
Part of the brain which controls conscious activities.
cerebrum
What are the three bones in the middle ear that amplify sound?
Malleus (hammer), incus (anvil), stapes (stirrup)
Keeps a person awake and alert.
thalamus
Processes visual stimuli.
occipital lobe
Allows light to enter the eye