term1 Definition1term2 Definition2term3 Definition3
Please sign in to your Google account to access your documents:
Function of the iris? (in the eye)
Has muscles which control the amount of light that enters the eye.
How is the pupil and iris related?
Iris is the circle bit around the pupil.
Iris muscles control the size of the pupil.
Pupil is the black dot through which light enters the eye.
Front (Term)
-
Pacinian corpuscles are mechanoreceptors.
What are mechanoreceptors?
Detect mechanical stimuli
e.g. pressure, vibrations
Explain which of these will produce a bigger generator potential?
Punching someone
Touching someone gently
• stronger stimulus -> excites the membrane more
• bigger movement of ions
• bigger change in PD across the cell membrane -> bigger generator potential
In simple terms, describe the sequence of events that leads to a generator potential?
• stimulus detected
• cell membrane excited -> becomes more permeable (ion channels open)
• influx of +ve ions (such as Na+)
• this alters the pd across the cell membrane
What is meant by a cell being in its resting state?
The cell is not being stimulated
Role of receptors?
Convert the energy of the stimulus into electrical energy (an impulse)
Need help typing ? See our FAQ (opens in new window)
Please sign in to create this set. We'll bring you back here when you are done.
Discard Changes Sign in
Please sign in to add to folders.
Sign in
Don't have an account? Sign Up »
You have created 2 folders. Please upgrade to Cram Premium to create hundreds of folders!