Homostasis Flashcards
What is homeostasis
ability to regulate internal conditions so reactions can happen at optimal rates
what does the body need to regulate
blood glucose concentration
internal temperature
water levels
what happens in the nervous system
receptor detects change due to a stimulus where electrical impulses are sent to the spine via sensory neurons. then to the brain where sends a response to the effector by the motor neurons where a response is carried out
what are the signals between neurons called
synapses
how do electrical impulses get passed between cells
electrical impulses are temporarily changed into chemical signals called neurotransmitters
what happens during a reflex
receptors detect stimulus where sensory neurons send electrical impulses to the spine where the relay neuron passes impulses into the motor neuron which passes into the effector and a response is carried out
What is the endocrine system
glands that secrete hormones to send signals to effectors via the blood
what does the pituitary gland do
sends signals to other glands
what does the thyroid gland do
controls the growth and metabolism
what does the pancreas do
releases insulin and glucagon which regulate blood sugar levels
what does the adrenal gland do
releases adrenaline which increases breathing rate and heart rate to prepare for fight or flight
ovaries and testies
releases sperm,eggs and hormones
what is a hormone
a chemical messenger secreated by the glands into the bloodstream to get to a target organ
how do synapses work
electrical impulses arrive at the synapse they are then turned into a chemical called neurotransmitters and are diffused across and bind to a receptor they are then turned back into an electrical impulse.
What are random errors
Using equipement incorrectly
Caused by variation in condition
Take a mean