Announcements

 September 2015
 


         Hello to all of my wonderful students!  It is such a pleasure to 
have met all of you and to have the opportunity to work with you.  

         I am looking forward to an exciting and challenging year in Science 
and I know you will truly enjoy Life Science as much as I enjoy teaching it!

Sincerely,

Mrs. Jansen

__________________________________________________________________________
MONDAY MAY 2, 2016

DONT FORGET TO STUDY FOR YOUR NERVOUS / ENDOCRINE TEST! IT IS SCHEDULED 
FOR FRIDAY, MAY 6, 2016!
 
REVIEW SHEET

Nervous, Endocrine, and Reproductive System Test – What to study…
A. Nervous and Endocrine  REGULATION
	- both help to maintain homeostasis
B. Nervous System
1. Impulse – ELECTRICAL and CHEMICAL message
2. Structure of a neuron – KNOW THE PICTURE
		- Dendrites – beginning of neuron that receives the impulse 
(have receptors on them)
		- Cell Body – contains nucleus
		- Axon – carries impulse from cell body to the terminal 
branches
		- Terminal branches – end of neuron that releases 
NEUROTRANSMITTERS
		- Synapse – space between 2 neurons (bw terminal branches and 
dendrites)
3. Nervous system divided into:
		- CNS – Central Nervous System
		- brain and spinal cord
		- made up of interneurons
		- PNS – Peripheral nervous system
		- made up of sensory and motor neurons
4. Brain
		- Cerebrum – controls MEMORY, THOUGHT, REASONING
		- Cerebellum – controls BALANCE and COORDINATION
		- Medulla Oblongata – controls all INVOLUNTARY activities

Reflex arc: Receptor Sensory neurons interneurons  motor neurons effector     
				                        
C. Endocrine System
1. Endocrine glands secrete HORMONES directly into the BLOOD
		- bind to RECEPTORS on TARGET CELLS
		- only need small amount
2. Endocrine glands – KNOW THE PICTURE
		- Hypothalamus – part of the brain that controls the 
pituitary gland
		- Pituitary gland – “Master gland” – controls other glands
			- TSH (Thyroid stimulating hormone) – stimulates 
thyroid
			- GH (growth hormone) – causes elongation of bones
			- LH and FSH – stimulate the ovaries
		- Thyroid – secretes thyroxine to regulate METABOLISM
		- Parathyroid – regulate CALCIUM levels in blood
		- Adrenal glands – secrete adrenaline to speed up life 
activities in times of stress
		- Pancreas – regulate blood glucose levels
			- Insulin  decreases blood glucose levels
			- Glucagon – increases blood glucose levels
		- Gonads – sex glands
			- Ovaries – secrete ESTROGEN and PROGESTERONE
			- Testes – secrete TESTOSTERONE
3. Negative feedback: helps maintain homeostasis by keeping hormone levels 
STABLE
		- Examples: 
			- Blood glucose levels remain stable by secreting 
insulin and glucagon
			- Thyroxine levels remain stable by the pituitary 
gland and the thyroid gland