6.1 Flashcards
(13 cards)
What does the nervous system do?
Maintains homeostasis
Senses the environment and responds
What are the three communication processes of the nervous system?
Sensory: collects and receives info (input/afferent)
Integrative: processes, interprets and responds
Motor: instructs, issues command (output/efferent)
What in the central nervous system (CNS)?
Brain and spinal cord enclosed in bony coverings
What is the peripheral nervous system (PNS)?
Nerve = bundle of axons in connective tissue
Ganglion = swelling of cell bodies in a nerve
What are features of the CNS?
Lined by meninges
Covered in cerebrospinal fluid (CSF)
What are the function is the PNS?
nerves
- cell processes
- connectors
- cranial and spinal
Ganglia
- group of nerve cell bodies
Nerve endings
- innervating tissues and organs
What are the sensory divisions of the PNS?
Somatic sensory: receives info from skin, fascia, joints, skeletal muscles, special senses
Visceral sensory: receives information from visceral
What are the motor divisions of the PNS?
Somatic motor: voluntary nervous system, innervates skeletal muscle
autonomic motor: involuntary nervous system, innervates cardiac muscle, smooth muscle, glands
What are the three divisions of the autonomic nervous system?
Sympathetic division (fight or flight)
Parasympathetic (rest and digest)
Enteric division (muscles and glands of the digestive system)
What increases during sympathetic activity?
Mental alertness
Metabolic rate
Activation of energy reserves
Respiratory rate
Heart rate and blood pressure
Activation of sweat glands
What decreases during sympathetic activity?
Digestive and urinary function
What increases in parasympathetic activity?
Secretion (salivary glands, digestive glands)
Urination
Defecation
Conservation of energy
What decreases during parasympathetic activity?
Metabolic rate
Heart rate and blood pressure
