For Optional Activity:
water bath equipped with temperature control mechanism set at 37.0°C (98.6°F) laboratory thermometer
The endocrine system consists of ductless endocrine glands that act together with parts of the nervous system to help control body activities. The endocrine glands secrete hormones that are transported in body fluids and affect cells possessing appropriate receptor molecules. In this way, hormones influence the rate of metabolic reactions, the transport of substances through cell membranes, and the regulation of water and electrolyte balances. By controlling cellular activities, endocrine glands play important roles in the maintenance of homeostasis.
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