BIOLOGY 252 EXAM 1 ELABORATION QUESTIONS AND CORRECT ANSWERS

BIOLOGY 252 EXAM 1 ELABORATION QUESTIONS AND CORRECT ANSWERS

What is homeostasis? - ANSWER how varied components of living things adjust to
maintain a constant internal living environment. There is a balanced dynamic
state! Diseases result from homeostatic imbalances (diabetes)
What are the levels of organization? - ANSWER chemical - cellular - tissue - organ -
organ system - organismal
What is the nervous system made of? - ANSWER The Central nervous system
(brain and spinal cord) and the peripheral nervous system (cranial nerves and
spinal nerves).
What is the big picture of the nervous system? What does this mean? - ANSWER
Input - Processing - Output. Explain.
Most of our wiring is _____. - ANSWER insulated.
Neuron - ANSWER
Describe the soma, neurofibrils, Nissl bodies, dendrites, axon and axon hillock. -
ANSWER Soma- body of the neuron cell.
Neurofibrils- work with microtubules to compartmentalize rough ER into Nissl
bodies.
Nissl bodies- help identify neurons in tissue sections with mixed cell types
Dendrites- primary site for receiving signals from other neurons
axon hillock- nerve fiber where axon originates
axon- conducs nerve signals to remote point from the soma. contains Varicosities
secrete NTs.

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