Bio 1- L21- Nervous Regulation of Physiological Function

what is homeostasis

maintaining a relatively constant internal environment with dynamic change

what are internal and external environment

internal- composition of body fluids, temperature, metabolites, blood pressure, O2 and CO2

external- temp, O2, CO2, water, food, light

what are the 2 systems responsible for homeostasis- and how fast, what’s involved etc

1. nervous system- neurons and glia- hard wired fast paced, local cellular response

2. endocrine system- messengers are hormones

nervous regulation- CNS what does it do

1. central nervous system- info processing- blood pressure, blood glucose- brain and spinal cord

nervous regulation- peripheral nervous system what does it do- 2 types

1. afferent neurons0 brings information to the CNS- external stimuli

2. efferent neurons- motor and somatic and controls skeletal movements

nervous regulation- autonomic what does it do

• controls nervous system in the cut

• sympathetic and parasympathetic

what is in the forebrain

cerebrum, thalamus, hypothalamus

what does the hypothalamus control?

• has the bodies thermostat- overlaps with the endocrine system

what does the temporal lobes do? what does the occipital lobe do?

• temporal- they are important for memory

• occipital- visual processing

what regulates he endocrine system?

• forebrain- thalamus, hypothalamus, cerebrum, pituitary glands

peripheral nervous system: spinal nerves

• spinal cord- link between brain and peripheral nervous system

• inetgrating center for spinal reflexes

• 31 pairs

what does the the peripheral nervous system do?

• sensory - information from sense organs and blood pressure- go for processing

• outflow- motor neurons from brain to organ systems

olfactory nerve

• cranial nerve 1- brings chemical information

ocular nerve

• cranial nerve 3- branches around the body- within lungs, gut and heart- autonomic

organisation of our nervous system

• visceral afferent- from organs within body

• sensory- somatic sensation- touch/pressure and temperature

motor- peripheral nervous system- what does it do? voluntary/imvoluntary?

• voluntary

• carries signals- move muscles when we choose to besides knee jerk

autonomic- peripheral nervous system- what is it what dos it regulate?

• regulated smooth and cardiac musce

• involuntary

types of autonomic- 2 types

• in the peripheral NS

• sympathetic- figh/flight- increase in some variable

• parasympathetic- rest and digest- calming- decrease in something