homeostasis and response Flashcards
What happens if our internal conditions aren’t at optimal levels?
Our enzymes denature and we have slower metabolic reactions.
What are the conditions we control in our body?
Temperature Urea Water Blood sugar Carbon dioxide.
What receives and processes information in the control system?
Coordination centre .
Whats the function of stimulus?
This causes change in the body’s state.
What does a receptor do?
This detects change and relays the information to the central nervous system.
What does the CNS do?(Central Nervous System?)
This coordinates a response through the use of effectors (Muscles or glands) which work to return the conditions to normal.
What is homeostasis?
Homeostasis describes all of the processes of a cell or and organism that work to keep optimal conditions in response to internal and external changes in the environment.
Why is homeostasis necessary?
Because humans are organisms that live in a changing environment and therefore need to adapt.
What are effectors?
Effectors are muscles or glands that act in response to a change in the internal or external environment.
What do neurones do?(nerve cells)
They carry electrical impulses between receptors, the CNS and effectors.
How many parts make up the CNS?
The CNS is made up of 3 parts.
What are synapses?
Synapses are gaps between neurones.
What do neurotransmitters do?
Neurotransmitters diffuse across the synapse and they bind to receptors on the next neurone.
What triggers the release of neurotransmitters at a synapse in the brain?
An electrical impulse.
Why are reflex actions important?
They let us react to dangerous situations quickly and automatically.
What are the components of a reflex arc?
Stimulus, receptor, neurones, effector and response.
Which part of a reflex arc carries the signal to the CNS?
The Sensory Neurone
Whats a receptor?
These are found all over the body, and detect change and initiate a signaling process within the body.
How can we investigate human reaction time?
By dropping a ruler and recording the length it was caught at.
Which factors can effect human reaction time?
Caffeine and exercise.
Examples of reflex action.
Sneezing,
Blinking,
Knee jerk response,
Dropping hot objects.
Whats the brain made up of?
Millions of interconnecting neurones.
Whats the medulla responsible for?
Unconscious activities such as breathing and heartbeat.
Whats the cerebellum responsible for?
Muscle coordination.
