B5 - Homeostasis And Response Flashcards
What is homeostasis?
Maintaining a stable internal environment
What are the three coordination centres in the body?
The brain, the spinal chord, the pancreas
The connection between 2 neurones is called….
A synapse
What do receptors do?
Detect stimuli
Are reflexes conscious or unconscious?
Unconscious
Are reflexes slower or quicker than normal responses?
Quicker
Sensory neurones carry electrical impulses from the receptors to the …
Central nervous system
Motor neurones carry electrical impulses from the CNS to the….
Effectors
What are effectors?
Muscles and glands that respond to nervous impulses
What is the RPA called related to the nervous system and reaction time?
Ruler drop test
Name the three methods used to study brain.
-study patients with brain damage
-electrically stimulating the brain
-MRI scans
What does electrically stimulating the brain involve?
Pushing a tiny electrode into tissue and giving it a small zap of electricity
What does MRI scan stand for?
Magnetic resonance imaging scanner
What 4 things does the cerebral cortex control?
- consciousness
- intelligence
- memory
- language
What does the medulla control?
Unconscious activities
Eg breathing
What does the cerebellum control?
Responsible for muscle coordination
What is a sclera?
A tough supporting wall of the eye.
What is the cornea?
A transparent outer layer found at the front of the eye.
Bends light into eye
What is the iris?
A group of muscles that allow the eye to control the diameter of the pupil and therefore how much light enters the eye.
Is the retina at the back or the front of your eye?
The back
During the iris reflex which muscle contacts when the eye is exposed to bright light?
The circular muscles
During the iris reflex which muscle contacts when the eye is exposed to dim light?
The radial muscle contracts
What is the function of the lens in an eye?
Focuses light onto the retina
What is the function of the optic nerve?
To carry impulses from the receptors on the retina to the brain.
