Endocrine and Circulatory Systems Moving materials and signals throughout your body

Question:  Compare and contrast hormones and neurotransmitters.

Endocrine System  The system in your body responsible for circulating hormones  signals sent throughout the blood stream

Hormones Proteins or lipids released by the body, transmitting signals to specific cells, telling them to perform specific functions 2 types: Steroids lipids, so easily enter cell Non-steroids generally proteins or other molecules that cannot enter the cell

Cells and receptors Any cell with a receptor for a certain hormone is considered a target cell to receive that hormone’s message

Cells and receptors Any cell with a receptor for a certain hormone is considered a target cell to receive that hormone’s message

Endocrine Glands Glands within the body that secrete one or more proteins, sending messages throughout the body. **These messages go directly into the blood stream! Regulated by feedback your body senses when enough is in your blood, and tells your gland to stop producing the hormone

Glands in your body

Pancreas- an example of feedback  Produces INSULIN  Chemical released to REMOVE glucose from your blood stream  Produces GLUCAGON  Chemical released to ADD glucose to your blood stream

Circulatory System

 Designed to move oxygen and nutrients throughout your body  Both enter through DIFFUSION

Diffusion in the Circulatory System  Of Oxygen…  Occurs in lungs-  Lungs have high concentration of O, blood has low  O diffuses INTO blood stream  Of Nutrients  Occurs in intestines  Nutrients have high nutrient concentration, blood has low  Nutrients diffuse INTO blood stream

Human Heart  4 chambers!  Left atrium, left ventricle  Right atrium, right ventricle

Heart Digram

The pathways  Right side  blood enters from body (oxygen poor) and is pumped to lungs  Left side  blood enters from lungs (oxygen rich) and is circulated throughout body  returns to right side  *Called a double loop system

the lingo…  Arteries  carry blood AWAY from the heart  Veins  carry blood BACK to heart  *Which is better for feeling your pulse?  Capillaries  TINY blood vessels in your body where most exchange happens

Question  List the things blood carries and why each is important to you.