Structure/Function: - by Dalton Shoemake

Heart :Composed of 4 chambers , the right and left atrium and the left and right ventricle. Pumps blood through out the body and keeps it full of oxygen by pumping it to and from the lungs.

Blood :A sticky red fluid that transports oxygen and nutrients throughout the body , serves as the body's transport system.

Blood vessels :Arteries, veins, and the capillaries. These all transport blood through out the body. Arteries are elastic tubes that carry blood away from the heart. Veins carry blood torwards the heart and capillaries are the smallest blood vessels that connect arteries and veins.

external image heart-blood-flow.gifEnzymes/Hormones:

Epinephrine: this hormone increases heart rate and lets the heart pump blood faster.

Norepinephrine: Increases heart rate and blood flow.

Brain Natriuretic Peptide: Decreases blood pressure.

Insulin: regulates blood sugar levels.

Acetylcholine: slows heart rate.

Renin: Increases blood pressure.


Baroreceptors monitor blood pressure.

The heart releases hormones like Renin and aldosterone to monitor blood pressure.

The heart regulates the direction of blood flow through arteries and veins .

Hormones like epinephrine regulate the speed at which the heart beats

The different chambers of the heart regulate the oxygenation of blood.


The circulatory system communicates with its own organs by using signals from the brain and hormones sent to certain organs.

It communicates with other systems through the blood. It sends hormones, nutrients, and wastes in the blood to various systems in the body. Other body systems use the blood of the circulatory system to communicate with each other .


external image 555894-5511-49.jpg