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Endocrine System, Nervous System and Homeostatic Control

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Endocrine System, Nervous System and Homeostatic Control Review for Unit Test #1 Endocrine system Information signaling system Glands produce hormones Circulate ... – PowerPoint PPT presentation

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Title: Endocrine System, Nervous System and Homeostatic Control


1
Endocrine System, Nervous System and Homeostatic
Control
  • Review for Unit Test 1

2
Endocrine system
  • Information signaling system
  • Glands produce hormones
  • Circulate through blood vessels
  • Regulate
  • mood, growth and development, tissue function,
    and metabolism

3
Hypothalamus
  • The hypothalamus controls body temperature,
    hunger, thirst, fatigue, anger, and circadian
    cycles.
  • Secretes hormones that tell other glands to
    create their hormones
  • GHRH

4
Pineal Body
  • Secretes Melatonin
  • Melatonin may help regulate sleep patterns

5
Pituitary Gland
  • Growth
  • Blood Pressure
  • Sex Organ Functions
  • Conversion of food into energy
  • Water regulation

6
Thyroid
  • Controls how quickly the body burns energy, makes
    proteins, and how sensitive the body should be to
    other hormones.

7
Parathyroid
  • The sole function of the parathyroid glands is to
    maintain the body's calcium level within a very
    narrow range.

8
Pancreas
  • Regulates blood sugar by producing Insulin

9
Adrenal gland
  • Produces Adrenaline
  • Fight or Flight Response
  • Dilate pupils
  • Increase heart rate
  • Suppress non emergency process
  • Boost oxygen and glucose supply

10
Testes and Ovaries
  • Both produce hormones to support body function
  • Testes
  • Testosterone
  • Ovaries
  • Progesterone
  • Estrogens

11
Nervous system
  • Made up of two major parts
  • Central Nervous System (CNS)
  • Peripheral Nervous System (PNS)

12
Neurons
13
Central Nervous System
  • Brain and Spinal Cord
  • Nerves
  • Ganglion

14
Brain
  • Consists of lobes, Each lobe having different
    functions.

15
Function
  • Process information
  • Dictate reactions and behaviors

16
Peripheral Nervous system
  • Nerves from spinal cord to rest of body
  • Create locomotion
  • Etc

17
Feedback Loops
  • Your nervous system is involved in almost all
    homeostatic control loops.
  • Reflex arc
  • Sensory Vs Motor
  • Affector Vs Effector

18
(No Transcript)
19
Neuron Function
  • Dendrites
  • Myelin
  • Schwann Cells
  • Axon
  • Node of Ranvier

20
Threshold
  • Before a neuron can send out a signal the stimuli
    has to pass the threshold

21
Action Potential
  • An action potential is a nerve impulse
  • An electrical shock sent down the axon

22
Action Potential
23
Synapse
  • A synapse occurs where ever the action potential
    meets the end of the axon
  • It needs to propagate across that gap
  • It does this through chemical messengers

24
Neurotransmitter Acetylcholine Enzyme that
destroys it Acetylcholinesterase
25
Synapse
  • When Acetylcholine jumps across the gap, it tells
    the next neuron to fire its action potential and
    the process continues

26
Homeostasis Summary
  • Homeostasis is the maintenance of a stable
    internal state within an organism.
  • Organisms must respond and maintain homeostasis
    in relation to many factors.
  • Organisms detect changes in their environment and
    respond to these changes in a variety of ways.   
  • These changes may occur at the cellular or
    organism level.
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