Unit 2 /1 Flashcards
What are receptor cells?
Groups of cells found in your sense organs.
Where do Sensory Neurons carry electrical impulses from-to?
Receptor cells to central nervous system
What does the CNS consist of?
Brain and spinal cord
Where do relay Neurons carry electrical impulses from-to?
Sensory to motor
Where are relay Neurons found?
In the CNS
Where do motor Neurons carry electrical impulses from-to?
CNS to effectors
What is the homeostasis?
The body’s constant internal environment
Negative feedback and maintaining a constant internal environment (equation)
- Receptor detects change in body temp
- Brain receives info
- Effector produces a response to return body temp to normal.
What does negative feedback mean?
That any changes are reversed and returned back to normal.
What are hormones and what do they control?
Chemical substances which control many processes in the body.
What are hormones secreted by and where are they transported to?
Glands and are transported to their target organs in the bloodstream.
What can too much glucose cause?
Serious health problems.
What are insulin and glucagon responsible for?
Maintaining a constant blood glucose level.
What does insulin cause the liver to do?
Remove glucose from the blood and store it as glycogen.
What does glucagon cause the liver to do?
Conversations glycogen into glucose and release it into the blood.
What do people who cannot control their glucose levels suffer from?
Diabetes
Which type of diabetes does not produce ANY insulin? 1 or 2
Type 1
Which type of diabetes does not produce ENOUGH insulin? 1 or 2
Type 2
How do people with type 1 diabetes control it?
Regular insulin injections,
Controlled insulin dosage
How do people with type 2 diabetes control it?
Change in lifestyle(diet and exercise)
How does the body maintain a constant temperature? (Using what,where in your body)
The thermoregulatory centre in the brain
One way the body maintains a constant temp
By increasing or decreasing the amount of sweat,which cools the body down by evaporation
What is tinnitus
Permanent ringing in ears
What can damage from loud music cause
Inability to hear certain frequencies
Above what dB can cause hearing loss?
85dB
What ions make solutions acidic?
Hydrogen ions (H+)
What ions make solutions alkaline?
Include the equation for this reaction
Hydroxide ions (OH-) H+ + OH- ==> H2O
