Besides controlling blood pressure and moving blood throughout the body it……

Circulatory/Cardiovascular System

Circulatory/Cardiovascular System

The main function of the circulatory system is to provide nutrients and oxygen to the various parts of the body, via the blood, which is circulated through the veins and arteries, like a giant transportation system.

Arteries carry the oxygenated blood from the heart to the cells and tissues, whereas veins return the oxygen-depleted blood from the cells to the heart.

The Two forms of Circulation

In systemic circulation, arteries collect the oxygen-rich blood from the heart and is transported to the body tissues. In the process, oxygen from the blood is diffused into the body cells; whereas carbon dioxide from the cells is diffused in the blood. This exchange of gases takes place with the help of capillaries that surround the body cells

The pulmonary circulation is a loop from the heart to the lungs. It is that portion, where deoxygenated blood from the heart is carried to the lungs and in turn, returns oxygenated blood to the heart.

The circulatory system works with the respiratory system and digestive system to supply oxygen and nutrients to the body.

Blood carries the messenger chemicals - hormones, secreted by the organs of the endocrine system. Thus, the circulatory system is also responsible for circulating hormones for proper communication between the body organs.

Circulatory/Cardiovascular System

Capillaries (smallest of blood vessels) - Controls flow of oxygen to cells and carbon dioxide from cells using the following feedback loop: If oxygen too low, gases flow from areas

of high concentration (capillaries)to low concentration (cells) to maintain levels

If too high, the opposite happens, gases flow from areas of high concentration (cells) to low concentration (capillaries).

Diseases/affliction of the cardiovascular/circulatory system

Heart attack High blood pressure Hemophilia Stroke Sepsis (infection) Bruises/contusions (hickey)

More than just breathing…

Respiratory System

Respiratory System

Air first enters your body through your nose or mouth, which wets and warms the air. (Cold, dry air can irritate your lungs.) The air then travels through your voice box and down your windpipe. The windpipe splits into two bronchial tubes that enter your lungs.

A thin flap of tissue called the epiglottis covers your windpipe when you swallow. This prevents food or drink from entering the air passages that lead to your lungs.

Except for the mouth and some parts of the nose, all of the airways have special hairs called cilia that are coated with sticky mucus. The cilia trap germs and other foreign particles that enter your airways when you breathe in air.

These fine hairs then sweep the particles up to the nose or mouth. From there, they're swallowed, coughed, or sneezed out of the body. Nose hairs and mouth saliva also trap particles and germs.

Within the lungs, your bronchi branch into thousands of smaller, thinner tubes called bronchioles. These tubes end in bunches of tiny round air sacs called alveoli.

Each of these air sacs is covered in a mesh of tiny blood vessels called capillaries. The capillaries connect to a network of arteries and veins that move blood through your body.

The muscle that helps the lungs breath is called the diaphragm. Breathing is something that happens passively, something that we don't even think about...that is unless it is something that becomes difficult to do.

Respiratory System

Lungs - Controls blood pH, amount of carbon dioxide in blood using the following feedback loop: If gets too low (acidic, pH below 7.4),

gets rid of excess CO2 (which caused the acid)

If gets too high (basic, pH above 7.4), retains more CO2

Diseases/afflictions of the respiratory system

Cold/flu Pneumonia Asthma Lung cancer Sinus infection allergies

Activity

Taking your pulse Lab: Measuring Lung Capacity