DH+notes


 * Excretory System (skin, sweating)
 * the more sweat glands=more copius sweat (2-4 million sweat glands)
 * the bigger sweat glands = more copius sweat (more sensitive to nerve stimuli, a nerve sends a signal from the brean to the sweat gland to secrete sweat


 * Body temperature regulation (nervous and Endocrine system)
 * the bigger sweat glands


 * sweat glands: present in all regions of skin. a sweat gland is a tubule that begins in the dermis and either opens into a hair follicle or, more often, opens onto the surface of the skin. Sweat glands play a role in modifying body temperature. When body temperature starts to rise, sweat glands become active. Sweat absorbs body heat as it evaporates. Once body temperature lowers, sweat glands are no longer active.
 * nervous system: consists of the brain, spinal cord, and associated nerves. The nerves conduct nerve impulses from sensory receptors to the brain and spinal cord, where integration occurs. nerves also conduct nerve impulses from the brain and spinal cord to the muscles and glands, allowing us to respond to both external and internal stimuli.