B5 homeostasis and response
methods of contraception
key words
Homeostasis
Homeostasis is the regulation of a constant
internal environment.
Synapses
A synapse is the gap where the ends of two neurons meet.
Nervous things
The Human Nervous System
The nervous system allows a fast, short-lived response to a stimulus in the surroundings. The information is
received by a receptor, passed along the neurons (nerve cells) as an electrical impulse and results in a response.
The Nervous Pathway
A stimulus is a change in the environment (internally or externally). In a typical response to stimuli, this information is received by the receptor and sent as an electrical impulse along a sensory neuron towards the central nervous system (CNS).
oral contraceptives
injection, implant or
skin patch
condoms or diaphragm
(female condom)
intrauterine devices
(coil)
spermicidal agents
abstaining from
intercourse
surgery
control of blood glucose
The pancreas is the organ and gland which monitors and
regulates the blood glucose concentration.
The Menstrual Cycle
The menstrual cycle occurs in females, approximately every 28 days. It is a cyclical process of the building of the lining of the uterus and ovulation. If the egg become fertilised by a sperm, then pregnancy follows. If the egg is not fertilised, then the lining of the uterus is shed away and leaves the body as the menstruation (or period)
Hormones
Hormones are chemical messengers transported in the bloodstream to an effector where they can activate a response. They are produced and released from glands around the body which all make up the endocrine system.
Diabetes
There are two types of diabetes: type 1 and type 2.
Type 1
Type 2
Type 1 diabetes is a disorder affecting the pancreas. In type 1 diabetes, the pancreas does not produce enough insulin to control the blood diabetes is usually treated by injections of insulin.
Type 2 diabetes is a disorder of effector cells which no longer respond to the hormones released from the pancreas. Type 2 diabetes can usually be managed through lifestyle choices such as maintaining a carbohydrate-controlled diet and regular exercise.
Reflex
A reflex is a fast and automatic response to a particular stimulus which may be harmful to the organism