YR3-B6-LSN6

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

LESSON 6

Homeostasis

Learning goals:

• I know what hormones do in our body.
• I know what a negative feedback loop
• I know how negative feedback results in homeostasis
• I understand the hormone cycle and how the various parts influence each other.

Key words:

Read the article under this link.

• homeostasis
• negative feedback
• positive feedback
• sensor
• controlor
• effector
• pituitary gland
• hypothalamus
• thyroid gland
• adrenal gland

• FSH
• LH
• estrogen
• progesteron
• testosterone

Hypothalamus

High

Low

Low

High

too high

too low

Homeostasis - keeping conditions inside the body in balance

                     done by the endocrine system and the nervous system

Negative feedback - causing the opposite reaction: 

                              temperature high      temperature low  

                              temperature low        temperature high

Positive feedback -  causing the reaction get even stronger

Examples of things which are under control: 

                             Blood sugar

                             Water level

                             pH

                             carbondioxide 

Summary