Flashcards in B1 - Coordination And Control Deck (43)
What is the purpose of the nervous system?
To enable the body to react quickly to the surroundings.
What is a receptor?
A cell that detects stimuli.
Give five of the receptors on the body.
Ears, eyes, nose and tongue, skin
Explain how information is passed to the brain.
Once a sensory receptor detects a stimulus, an impulse is sent along the sensory neurons up to the CNS.
How is information passed to the organs?
Impulses are sent from the CNS along motor neurons to the effector organs which are muscles or glands.
What is a reflex?
Some responses to stimuli are automatic and rapid.
Why are reflexes important?
Reflexes run everyday actions and prevent danger and damage.
What are the three types of neuron?
What is a synapse?
A gap between two nerves.
How do electrical impulses travel across the synapse?
-The impulse arrives at the synapse,
-chemicals are released into the gap between the neurons,
-the chemicals attach to the opposite neuron and form a new electrical impulse.
Give the general sequence of a reflex action.
Stimulus --> receptor --> coordinator --> effector --> response
How is the menstrual cycle controlled?
Hormones control the release of an egg and build of lining in the womb.
What are the three hormones that control the menstrual cycle?
FSH, oestrogen and LH.
Where is FSH released from?
The pituitary gland.
What is ovulation?
The maturing of an egg.
Where is the pituitary gland?
At the bottom of the brain.
What does FSH stand for?
Follicle stimulating hormone.
What two factors does FSH cause?
-Stimulates the ovary to produce oestrogen
Where is oestrogen released from?
What three factors does oestrogen cause?
-The lining of the womb to develop
-The inhibition of FSH production
-Stimulates the release of the mature egg.
What does LH stand for?
How can hormones prevent pregnancy?
Some contraceptives contain hormones which stop FSH production.
How can hormones be used to improve fertility?
FSH can be used to stimulate eggs to mature which can be used for IVF.
What does IVF stand for?
In vitro fertilisation
What is the Fallopian tube?
The tube between the ovary and womb.
Give three advantages of using fertility treatment.
-Families can be much smaller.
-Population growth can be controlled.
-The eggs can be stored for later use.
Give three disadvantages of using fertility treatment.
-The pill can cause health problems.
-The pill can be expensive.
-Some religious groups dislike contraception.
Give four conditions that have to be controlled in the body.
-Core body temperature
-Blood sugar level.
What is homeostasis?
The controlling of conditions in the body.