Nervous System
The nervous system is divided into 2 main parts, what are they?
Central Nervous System (CNS)
Peripheral Nervous System (PNS)
What 2 organs does the CNS include?
Brain and Spinal Cord
Fight or flight; increase heart rate, blood pressure, breathing & decreased digestion
What is the endocrine system & it's function(s)?
regulating metabolism, growth, stress response, & reproduction by releasing hormones into the bloodstream, and helps maintain homeostasis
Acts as processing center: receives info from the body, analyze it & sends out commands
CNS
What is the description and function of cerebrospinal fluid?
clear watery fluid from brain that functions as: protection, homeostasis, nutrient & hormone transport, and waste removal
The parasympathetic nervous system is also know as...
Rest & Digest; decreased heart rate, blood pressure, breathing
What is the definition of an endocrine gland?
any tissue or organ that secretes hormones directly into the bloodstream
Acts as communication pathway: carries signals from CNS to the rest of the body & sensory info back to CNS
PNS
What is the description and function of the brain?
3 lbs of 100 billion+ neurons and even more glial cells that function as primary receiver, organizer, & distributor of info in the body
What is the more specific functions of the PNS?
connect CNS to:
skeletal muscles to oversee CONSCIOUS activities
viscera (heart, stomach, intestines, etc) to oversee UNCONSCIOUS activities
What is a hormone?
chemicals that affect the metabolism or behavior (growth, reproduction, stress response) of a cell
What are the 3 functions of the nervous system?
Sensory
Integration
Motor Output
What are 3 parts of the brain stem (from top to bottom)?
1. midbrain
2. pons
3. medulla oblongata
What 2 parts of the brain make up the diencephalon?
thalamus & hypothalamus
Name 2 endocrine glands
adrenal
hypothalamus
ovaries
testes
pancreas
parathyroid
pineal gland
pituitary gland
What is considered a chemical messenger?
Neurotransmitter
This part of the brain is associated with regulation and coordination of movement, balance, & posture, also called the 'little brain'
Ex: helps control our movements like being fine tuned
Cerebellum
You are walking through the woods when you suddenly encounter a bear. Your heart rate increases, your breathing becomes faster, and you feel an overwhelming surge of energy to run. After escaping the bear and finding a safe spot, your heart rate slows down, your breathing becomes steady, and you begin to feel calm again. Which nervous systems are responsible for these two different physiological responses?
Sympathetic nervous system for the initial response
parasympathetic nervous system for the recovery
What are the 4 steps of how the endocrine system works?
Hormone release → Receptor binding → Target cell response → negative feedback signal to inhibitor begin to secrete again