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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 |
Created by:
mbrennan262
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