Biology 252 Exam 1 Questions and
Answers
What is homeostasis? - Ans:-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? ...
What are 3 properties that enable communication with other cells? - Ans:✔✔-1. Excitability (response to
stimuli or environmental change).
2. Conductivity ( production of electrical signals that are conducted to other cells at distant locations).
3. Secretion (when a signal reaches the end of a nerve fiber, neuron secretes a NT that crosses gap and
enters the next cell).
What are sensory neurons? - Ans:✔✔-(dealing with the five senses) They are a part of the PNS (afferent).
They conduct signals from receptors to the nervous system. Detect stimuli and transmit info TOWARDs
the CNS.
somatic: bones, joints, and muscles
visceral: comes from inside us like internal organs
(organized by location)
What are interneurons? - Ans:✔✔-They lie within the CNS. They receive signals and carry out the
integrative function of the nervous system. They take info from sensory neurons in the PNS and make
decisions.
What are motor (efferent) neurons? - Ans:✔✔-sends signals AWAY from the CNS to primarily muscle
cells (effector).
somatic: skeletal muscle
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