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Gr 7 Science Ch 3
Gr 7 Science Ch 3.3 (Nervous, Endocrine, & Reproductive Systems)
Term | Definition |
---|---|
nervous system | body system that coordinates body activities |
central nervous system (CNS) | major division of the nervous system that is composed of the brain and spinal cord |
peripheral nervous system (PNS) | major division of the nervous system that is composed of the nerves and ganglia |
nerves | bundles of nerve fibers that connect the central nervous system with the rest of the body |
impulses | electrochemical message transmitted by a nerve |
brain | chief organ of the nervous system |
cerebrum | portion of the brain that controls conscious thought and reason |
cerebellum | portion of the brain responsible for balance and skeletal muscle coordination |
brain stem | portion of the brain that connects the rest of the brain to the spinal cord |
spinal cord | organ that transmits impulses from the brain to the peripheral nervous system |
sensory nerve fibers | nerve fiber that transmits information to the brain and spinal cord |
motor nerve fibers | nerve fiver that transmits messages from the central nervous system to the muscles and other organs |
sensory receptors | any of the special nerve endings that detect the conditions in and around a person |
hormones | any of the chemical substances responsible for controlling many automatic activities of the body |
endocrine system | body system that produces hormones |
gland | body structure that secretes a chemical substance |
endocrine glands | any gland of the endocrine system |
pituitary gland | endocrine gland, located at the base of the brain, whose hormones control the action of other endocrine glands |
thyroid gland | bow-tie-shaped gland that is located below the larynx and produces thyroxine |
parathyroid gland | several small endocrine glands that work with the thyroid gland to control the amount of calcium in the blood |
adrenal gland | endocrine gland that produces the hormone epinephrine |
islets of Langerhans | clusters of endocrine glands within the pancreas that secrete insulin and glucagon |
diabetes mellitus | disease caused either when not enough insulin is produced or when the body does not respond properly to the insulin that is produced |
pineal gland | endocrine gland that serves as a clock to control waking and sleeping |
reproductive system | body system responsible for producing new human beings |
gonads | organ that produces reproductive cells and sex hormones |
egg cell | female reproductive cell |
sperm cell | male reproductive cell |