1 / 11

Homeostasis

Homeostasis. Nervous System and Endocrine System. Homeostasis. The endocrine system of glands and hormones works with the nervous system of impulses and neurotransmitters The combination of chemical and electrochemical messages allows organ systems and tissues to communicate with each other.

arlene
Download Presentation

Homeostasis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Homeostasis Nervous System and Endocrine System

  2. Homeostasis • The endocrine system of glands and hormones works with the nervous system of impulses and neurotransmitters • The combination of chemical and electrochemical messages allows organ systems and tissues to communicate with each other

  3. The nervous system • Comprised of a central nervous system (CNS) that includes the brain and spinal cord and a peripheral nervous system of motor and sensory nerves

  4. Nervous system temperature control • An example of a homeostatic system is temperature control • The CNS (hypothalamus) receives sensory input from the PNS • Messages are relayed to effectors (muscles and glands) in response

  5. A Motor nerve • Cell bosy contains the nucleus • Dendrites bring nerve impulses towards the cell body • Axons take nerve impulses away from the cell body • Axons are wrapped in Schwann cells – they form the lipid based myelin sheath • Nodes of Ranvier occur between Schwan cells

  6. The Nerve Impulse • Normally, a nerve cell has a high concentration of positive ions outside the cell membrane • There is a low concentration of positive ions inside the cell • This results is polarization • Reversing this polarization is a nerve impulse

  7. The Resting Potential • A sodium – potassium pump (Na+ / K+) pumps K+ inside and Na+ outside (no change yet...) • Facilitated diffusion allows K+ out and Na+ back in • K+ is MORE permiable and flows out faster • The result is a positive charge outside the cell

  8. Action Potential • The rapid depolarization of the cell membrane • Reversal of the charge along the membrane • Triggered by a stimulus • Followed by a period of repolarization and a refractory period when the neuron cannot fire

  9. Synaptic transmissions • The action potential travels the length of the axon until it reaches the synapse • Vessicles release neurotransmitters into the space between connecting neurons • Neurotransmitters diffuse across

  10. Synapse • The neurotransmitters bind to receptors on the next cell and initiate a second response • They are then broken down by enzymes or reabsorbed ito the pre-synaptic neuron

More Related