Coordination of response

Question 1

What must organisms do to survive

Answer 1

-organisms must find favourable external conditions e.g avoiding places that are too hot
-find food
-avoid harm

Question 2

How do organisms detect changes in the environment

Answer 2

-Receptor cells detect stimuli
-Receptor cells can be found in sense organs (e.g nose eyes) or inside of the body (e.g pacinian corpuscle pressure receptors)

Question 3

Effectors

Answer 3

Part of the body that responds (muscle or gland)

Question 4

what are hormones

Answer 4

-Hormones (known as chemical messengers) are chemical substances produced by the endocrine glands and transported by the blood

Question 5

What are the functions of hormones

Answer 5

-Hormones transmit information from one part of the body to another
-Hormones cause a change by altering the activity of one or more target organs by leaving the blood and binding to specific receptors on the cell surface membrane of the target organ

Question 6

When are hormones used

Answer 6

-Hormones are used to control functions that do not require instant responses
-This is because hormones are slower in action than electrical impulses

Question 7

Endocrine system + glands

Answer 7

-Endocrine glands that secrete hormones in animals is collectively known as the endocrine system
-Endocrine glands secrete hormones directly into the blood
-Endocrine glands can be stimulated to secrete hormones by either the action of another hormone or the arrival of a nerve impulse

Question 8

Pathway of hormone action + high blood pressure example

Answer 8

Stimuli (high blood pressure)—Receptor (receptors in the pancreas)—Hormone (insulin)—Effector (liver cells)