Flashcards in Nervous System Deck (14):
What is the nervous system known for ? (2)
Master controlling & communication system
4.5 lbs or 3% of body mass
Sensory function involves?
Detect internal/external stimuli
Sensory info sent to brain & spinal cord
What is the integrative function?
Processes sense info
Analyze, stores, & response decisions
What does the motor function include?
Make appropriate response
Activates effectors (muscles & glands)
Organization of the nervous system has 2 categories . What are they?
Central & peripheral nervous system
Central nervous system (CNS) consists of?
Brain -100 billion neurons
Spinal cord - 100 million neurons
Central nervous system (CNS) function?
Function: processes sensory info
Source of thoughts, emotions, memories
Signals muscles to contract & glands to secrete
Peripheral nervous system (PNS) consists of?
Consists of (outside of CNS): cranial & spinal nerves
Peripheral nervous system (PNS) function?
Links nerve impulses of body to CNS
Divisions of peripheral NS?
Sensory neurons convey info to CNS
-from head, body wall, & limbs
-from special senses (vision, hearing, etc)
Conduct impulses from CNS to skeletal muscles only!
Actions: Voluntary control
Sensory neurons convey to CNS
-from sense receptors in visceral organs
Motor neurons conduct impulses from CNS to
- smooth & cardiac muscle
100 million neurons cover length of gastrointestinal tract
Monitors chemical changes in GI tract
Causes contraction of smooth muscle in GI tract (smooth muscle, glands, and endocrine cells of GI tract)
Enables secretions of GI fluids & hormones
Actions: involuntary control