(DON'T NEED)Homeostasis Flashcards
1
Q
What is homeostasis?
A
Regulating conditions inside the body or cells to have optimum conditions for function in response to internal and external changes
2
Q
What is the central nervous system?
A
- Consists of the spinal cord and the brain only
- Connected to the rest of the body by sensory neurons and motor neurons
- Receives information from receptors and then coordinates a response (the response is carried out by the effectors)
3
Q
What are sensory neurons?
A
- Neurons that carry information as electrical impulses from the receptors to the CNS
4
Q
What are motor neurons?
A
- Carry electrical impulses from the CNS to effectors
5
Q
What is a relay neuron?
A
- They connect sensory neurons to motor neurons
6
Q
What are effectors?
A
- Muscles and glands which respond to nervous impulses
- They bring about a change
- Muscles contract
- Glands secrete hormones
7
Q
What is the nervous system made up of?
A
- CNS
- Motor neurons
- Sensory neurons
- Effectors
- Receptors
8
Q
What are receptors?
A
- Cells that detect stimuli
9
Q
What is a synapse?
A
- The connection between two neurons
- The nerve signal is transferred by chemicals which diffuse across the gap
- The chemicals then set off a new electrical signal in the next neuron
10
Q
What is a reflex?
A
- A rapid and automatic response to a certain stimuli that doesn’t involve the conscious part of the brain, reduce injury
11
Q
What is the reflex arc?
A
- The neurons in reflex arcs go through the spinal cord
- When a stimulus is detected by the effectors, impulses are sent through the sensory neuron to a relay neuron in the CNS
- When the impulse reaches a synapse, a chemical is released , the chemical causes impulses to be sent through the relay neuron
- The impulses then travel through the motor neuron to the effector (usually the muscle)
- The muscle then contracts to move your hand away from the danger
- This is quicker since you don’t have to think about it
