Anatomy and physiology the unity of form and function chapter 12 Questions & Answers A+ Review
endocrine system - ANS-communicates by means of chemical messengers (hormones) secreted into the
blood
nervous system - ANS-employs electrical and chemical means to send messages from cell to cell
three basic steps carried out by the nervous system - ANS-- sense organs receive information about
changes in the body and external environment, and transmit coded messages to the brain and spinal
cord- CNS
-CNS processes this information, relates it to past experiences, and determines appropriate response
-CNS issues commands to muscles and gland cells to carry out such a response
Central Nervous System (CNS) - ANS-brain and spinal cord enclosed by cranium and vertebral column
Peripheral Nervous System (PNS) - ANS--All the nervous system except the brain and spinal cord;
composed of nerves and ganglia
nerve - ANS-a bundle of nerve fibers (axons) wrapped in fibrous connective tissue
ganglion - ANS-a knot-like swelling in a nerve where neuron cell bodies are connected; come out from
the nerve
Peripheral Nervous System (PNS) - ANS-contains sensory and motor divisions each with somatic and
visceral subdivisions
sensory (afferent) division - ANS-carries signals from receptors to CNS