B1.2 Nerves and Hormones Flashcards
What do receptor cells do?
Detect stimuli/changes in the environment.
What does the nervous system allow humans to do?
React to their surroundings and coordinate their behaviour.
What do eyes detect?
Light.
What do ears detect?
Sound and changed in position.
What do tongues/noses detect?
Chemicals.
What does the skin detect?
Touch, pressure, pain and temperature change.
What key organelles do light receptor cells have?
- Nucleus
- Cytoplasm
- Cell Membrane
Describe the nervous pathway.
Receptors detect a stimuli and send an impulse along the sensory neurone. A chemical transmitter is then released from the sensory neurone and then crosses a synapse which reaches the relay neurone to get to the central nervous system. The impulse then travels back through the relay neurone to the chemical transmitter which is released from the relay which then crosses the synapse to the motor neurone. The impulse then reaches the effector (gland or muscle) and then produces the response (muscle contracts).
What is a synapse?
Junction between two neurones.
What is a hormone?
Chemical substances that control processes in the body.
What are the three hormones in the menstrual cycle?
FSH, LH and Oestrogen.
Where is FSH released?
Pituitary gland.
Where is LH released?
Pituitary gland.
Where is oestrogen released?
Ovaries.
What is the function of FSH?
To stimulate the egg to mature in the ovaries. To stimulate the ovaries to produce oestrogen.
