The Nervous System
What is the functional unit of the nervous system?
neuron
all nervous tissue outside of brain and spinal cord (CNS)
Normal visual acuity is
20/20
Main function of circulatory system?
transport/circulation
Blood clotting disorder
hemophilia
Neurons can be classified by function or structure. What is the most common type based on structure?
multipolar
Bundles of nerve fibers are called _ and are held together by the _.
fascicles...perineurium
How does your pupil respond to bright light?
constricts/gets smaller
cardiovascular and lymphatic
What's the bottom tip of the heart called?
apex
A change in the environment that may be of sufficient strength to initiate an impulse?
stimulus
What are the two branches/divisions of the autonomic nervous system?
sympathetic & parasympathetic
What is missing from the passage of light through the eye? cornea, aqueous humor, pupil, _, vitreous humor, retina
lens
Which vessels lead away from the heart?
arteries
What prevents oxygen-rich and oxygen poor blood from mixing in the heart?
interventricular septum
What is the period of time after an impulse passes when a neuron cannot conduct and impulse called?
The refractory period
Which nerve is responsible for facial sensations and activating the chewing muscle (masseter)
Trigeminal
What is the condition where eye pressure builds due to inadequate draining of aqueous humor?
glaucoma
Which side of the heart has oxygen rich blood?
left
antigens
What are the first three steps of nerve impulse conduction?
Threshold reached, depolarization, repolarization
What type of nerves is the facial nerve made up of?
both sensory and motor
Where do tracts from each optic nerve cross over?
optic chiasm
Smallest and most numerous blood vessels?
capillaries
Leukocyte responsible for maintaining tissue homeostasis.
macrophage