Mistakes

• Sense organs = a group of receptor cells that respond to specific stimuli
• Plural for stimulus = stimuli
• (reflex arc) relay neurone transmits the signal (via another synapse) to the motor neurone
• (Reflex arc) The motor neurone stimulates the effector which carries out the response (contracts)
• Lens = a clear, flexible structure that makes images on the eye’s retina. Can change shape to focus on objects.
• what can be an effector in the eye bar the iris?

  the eyelid muscle (blinking)
• Negative feedback definition: a change from normal conditions in the body which causes a response to bring conditions back to normal
• The pancreas releases the hormone into the blood -> liver then acts
• Glucagon = hormone glycogen= group of glucose
• Liver converts excess glucose into glycogen when blood sugar levels are too high
• Liver breaks down glycogen into glucose when blood sugar levels are too low
• Diabetes = a disease caused when your body is incapable of controlling it’s blood sugar levels
• Untreated diabetics have glucose in urine as excess glucose is not stored in their liver as glycogen = type 1
• Blood glucose remains high despite insulin being released as liver cells don’t respond to insulin -> type 2
• Pancreatic tissue transplant = both types (but rejection may occur and have to take drugs)
• Insulin injections = type 1
• Erector muscle NOT effector (skin)
• NOT hair erector muscles -> erector muscle (in the skin)