Science assessment task 4 section 2: biology

biology: homeostasis, disease, immune system, lines of defence, feedback loops.

parts of the central nervous system (CNS)

brain, spinal cord

parts of the peripheral nervous system (PNS)

billions of nerves

function of CNS

manages body functions, thoughts and movement

function of PNS

sending sensory information to CNS and carries out commands from brain

reaction time

how long it takes for nervous system to detect stimulus, process the information and execute a response

feedback loop order

stimulus → receptor → control centre → effectors → response

stimulus

changes that occur

receptor

detects change

control centre

analyses messages and initiates actions

effectors

muscles, organs, glands

endocrine system function

coordinate the body’s organs, produces hormones through glands

what hormones does the piuitary gland secrete?

produces many hormones including anti-diuretic hormone

anti-diuretic hormone (ADH)

affects the amount of urine produced by the kidney

what hormones does the pancreas secrete?

insulin and glucagon

what hormones do testes (in males) secrete?

testosterone

what hormones does the ovary secrete?

oestrogen and progesterone