Endocrine system
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Define homeostasis
Homeostasis is the maintenance of a relatively stable internal body environment, despite changes in the external environment
What is the negative feedback loop
Stimulus - change in external or internal environment Receptors - name receptor and detect stimulus and send a signal to the control center The control center - Hypothalamus/brain decodes the signal and sends a message to the effector muscles, organs or glands The effector- name muscles, organs or glands Response - name what the effectors do
pancreas
regulates the level of sugar/glucose in the blood stream
adrenal gland
helps trigger flight or flight response by releasing adrenaline into the blood stream
physiological effects of adrenaline
increased heart rate, increased sweating, dilated pupils increased breathing rate, deeper breaths, glucose released from liver and muscles and blood diverted from skin and intestines to muscles
Insulin
lowers blood glucose levels by turning glucose into glycogen to be stored
target cells of insulin and glucagon
liver and muscles
glucagon
increases blood glucose levels by turning glycogen into glucose
where are glucagon and insulin made
pancreas
How do hormones reach their target cells
Hormones travel in the blood stream and have a specific shape so they will only bind to the complementary shape of their target cell