Homeotstasis Flashcards
What is homeostasis?
Homeostasis is the process by which the body keeps its internal environment stable and balanced, even when the outside conditions change.
What are the three things the human body has to control?
Body temperature
Water levels
Blood glucose levels
What is a stimuli?
Changes in environment
What are receptors?
Cells that detect change the environment
What are coordination centres?
Areas that receive and process information , they coordinate a response
Why is homeostasis important?
To maintain optimal conditions for enzymes and cell function
What are three things all control systems include?
Receptors
Coordination centres
Effectors
What are the three coordination centres?
Brain
Spinal cord
Pancreas
What are synapses?
A gap between two neurons
How do synapses work?
Electrical impulses sent fown
They can travel through synapses
At the end of a neurone, chemicals released
Receptors on other neurone receive the chemical
Whats the difference between a hormonal system and a nervous system?
Hormonal
Uses chemical messages
Slow
Travels all over the body
Voluntary and involuntary
What are the three types of neuron?
Sensory- carry signals from sensory organs to CNS
Motor- sends signals from CNS to muscles and glands
Relay- connect sensory and motor within the CNS
What’s the role of the adrenal gland?
Respond to fear/ stress
Releases adrenaline
What’s the role of the ovaries?
Controls menstruel cycle
Releases Oestrogen and progesterone
What’s type 1 diabetes and how is it treated?
When the pancreas doesn’t produce enough insulin
Treated with insulin injections
Whats the role of the Pituitary Gland?
Stimulates the thyroid to make thyroxine to control the rate of metabolism
Controls growth in children
What hormones do pituitary gland release?
LH(luteinising hormone)
FSH( follicule stimulating hormone)
ADH(anti diuretic hormone)
What is the role of the thyroid?
To control the bodies metabolic rate
What hormones does the thyroid release?
Thyroxine
What’s the role of the pancreas?
To control blood glucose concentration
What does the pancreas release?
Insulin and glucagon
What’s the role of the adrenal glands?
Prepare body for fight or flight response
Respond to fear or stress
What hormone does the adrenal gland release?
Adrenaline
What do the testes release?
Testosterone
What happens on day 1-4 of the menstruel cycle? (Stage one)
Uterul lining breaks down (menstruation )
What happens on day 4-14 of the mensuel cycle? (Stage 2)
Lining of uterus builds up
What happens on day 14 of the menstrual cycle?(stage 3)
Egg releases from ovary- ovulation
What happens on stage 14-28 of the menstruel cycle? (Stage 4)
Wall lining is maintained
What does the FSH (Follicle stimulating hormone) do?
It causes eggs in the ovary to mature (the eggs grow surrounded by cells called follicles)
What does LH (luteneising hormone)do?
Stimulates the release of the egg at ovulation
What does oestrogen and progesterone do?
Stimulates the build up and maintenance of the uterus lining
