Bio ch12 Nervous systems and its functions Flashcards
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Yes it’s a lot to memorize
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The nervous system is responsible for
Perceptions behaviors, and memories. It initiatest all voluntary movement
Neurology deals with
Normal functioning and disorders of the nervous system
Peripheral Nervous system (PNS)
Consist of all nervous TISSUE Outside of the CNS.
CNS
Central nervous system consist of the brain and spinal cord.
CNS
Is also located in the skull and has 85 billion neurons
Spinal cord has
100 million neurons
Nerve is
A bundle of hundreds to thousands of axons plus associated connective tissue and blood vessels that lies outside the BRAIN AND SPINAL CORD
12 PAIRS OF CRANIAL NERVES
Emerge from the brain
31 PAIRS OF SPINAL NERVES
Emerge from the spinal cord
Ganglia
Are small masses or nervous tissue
Ganglia
Consisting primarily of neuron cell bodies
Ganglia
Located outside of the brain and spinal cord
Ganglia
Closely associated with cranial and spinal nerves
Enteric plexuses
Are extensive networks of neurons located in the walls of organs of the gastrointestinal track.
Sensory RECEPTOR
Refers to a structure of nervous systems that monitors the CHANGES IN THE INTERNAL AND EXTERNAL environment
PNS is divided into three parts
SNS (somatic nervous system )soma = body. And ANS (autonomic nervous system)auto=self,nomic=law.ENS (enteric nervous system)enteron=intestines
SNS consists of
(1) sensory neuron that convey info to the CNS and (2) motor neurons that conducts impulses from the CNS to the skeletal muscles only.
Sensory FUNCTION
Detect internal and external stimuli
Integrative FUNCTION
Processes sensory information. Activity known as integration
Motor FUNCTION
Activates effectors. Causes muscles to contract and glands to secrete.
PNS voluntary control
SNS somatic nervous system that controls skeletal muscle
PNS INVOLUNTARY control(2 systems)
ANS - autonomic nervous systems smooth muscle, cardiac and glands muscle.
ENS - enteric nervous system
endocrine cells of gi tract
Body system responsible for adaptive immunity and some aspects of innate immunity
Lymphatic system
Consist of a fluid called lymph, vessels called lymphatic vessels that transport than them a number of structures and organs containing lymphatic tissue (lymphocytes within filtering tissue) and red bone marrow.
Lymphatic system
