Communication and Homeostasis. A2 Biology F214. Why do multi cellular organisms need communication systems?.
A2 Biology F214
Organisms need to detect changes in internal environments such as temp, pH, water potential of blood , tissue fluid, level of toxins, etc as these can affect the ability of cells to function efficiently.
Enzymes, dehydration, lack of respiratory substrate, toxins inhibiting metabolism, etc.
Monitoring Controlling Internal conditions To keep them constant (or within safe limits) Despite external changes
Can you complete this with some real life examples?
Diagram to show changes to skin surface blood vessels in warm and cold conditions.
Match the stimulus, sense and receptors in the card sort activity
Use these terms to label the diagrams you have been given.
Sodium – Potassium pump online tutorial warm and cold conditions.
All stimuli produce warm and cold conditions.generator potentials but some don’t cause a big enough change in p.d. to reach threshold potential so no action potential is generated.
You should be able to: warm and cold conditions.Describe and explain how an action potential is generated.Interpret graphs of the voltage changes taking place during the generation and transmission of an action potential.
Small stimuli don’t cause a big enough change in warm and cold conditions.p.d. to generate an action potential.
(P.d. doesn’t reach generator potential.)
Local Current warm and cold conditions.
Transmission of Action Potentials warm and cold conditions.in myelinated neurones (Saltatory conduction)
Animation to explain a synapse warm and cold conditions.
Use your new knowledge to create a script to describe and explain the following animation: