Circulatory and Respiratory System

Alveolus

Tiny, thin-walled sacs in the lungs where oxygen and carbon dioxide are exchanged between air and the blood. Alveolus. An alveolus is a small air sac in the lungs that allows for gas exchange with the blood.

Artery

A blood vessel that carries blood away from the heart. Artery. An artery is a type of blood vessel that transports oxygen-rich blood from the heart to the rest of the body.

Asthma

A disorder which narrows the airways to the lungs, making breathing difficult. Asthma. Asthma is a condition where the tubes that carry air to the lungs become inflamed and narrow, leading to breathing difficulties.

Atrium

One of the two upper chambers of the heart, it receives blood from the body. Atrium. The atrium is a part of the heart that collects incoming blood from the body or lungs.

Blood pressure

The force that the blood exerts on the walls of the arteries. Blood pressure. Blood pressure is the pressure of circulating blood against the walls of blood vessels.

Bronchus

One of the two large tubes that connect the trachea to the lungs. Bronchus. A bronchus is an airway that carries air from the trachea directly into the lungs.

Capillary

A tiny blood vessel that allows the exchange of gases, nutrients, and waste products. Capillary. Capillaries are the smallest blood vessels in the body where oxygen and nutrients are delivered to cells and waste products are collected.

Circulatory system

The system of the heart, blood, and blood vessels, it moves oxygen, nutrients and waste. Circulatory system. The circulatory system is like the body's transportation network, delivering essential substances to cells and removing waste.

Diaphragm

The muscle below the lungs that controls breathing. Diaphragm. It is a dome-shaped muscle that helps draw air into the lungs by contracting and flattening when you inhale.

Emphysema

A lung disease that destroys lung tissue and makes breathing difficult. Emphysema. It is a condition where the air sacs in the lungs become damaged, leading to difficulty in breathing.

Heart

The muscular organ that pumps blood through the body. Heart. The heart is a powerful muscle that circulates blood to deliver oxygen and nutrients throughout the body.

Hemoglobin

The iron-containing protein in red blood cells that binds to oxygen. Hemoglobin. It helps carry oxygen from your lungs to the rest of your body.

Larynx

The voice box, it contains vocal cords. Larynx. The larynx is a part of the throat that helps produce sound and protects the airway.

Lung

The respiratory organ that absorbs oxygen from the air and removes carbon dioxide from the blood. Lung. The lung is a vital organ that helps you breathe by exchanging oxygen and carbon dioxide with the environment.

Lymph

A clear tissue fluid that moves between the blood and the lymph vessels, it transports fats and aids the immune system. Lymph is a fluid in the body that helps fight infections and removes waste.

Pharynx

The tubelike passage from the mouth, it carries food and air. pharynx. The pharynx is a part of the throat that helps move food to the esophagus and air to the windpipe.

Plasma

The liquid part of blood, it is clear yellow and contains blood cells. Plasma. Plasma is the fluid portion of blood that transports nutrients, hormones, and waste products throughout the body.

Platelet

A cell fragment that helps form blood clots. Platelet. Platelets are tiny pieces in the blood that help stop bleeding by clumping together and forming clots.

Pulmonary circulation

The flow of blood between the heart and the lungs. Pulmonary circulation. It is the process where blood moves from the heart to the lungs to get oxygen and then back to the heart.

Red blood cell

A disc-shaped cell that uses hemoglobin to carry oxygen from the lungs to the body. Red blood cell. It picks up oxygen in the lungs and delivers it to the rest of the body.

Systemic circulation

The flow of blood between the heart and all parts of the body, except the lungs, is called systemic circulation. Systemic circulation is the process by which oxygen-rich blood is carried from the heart to the body and then returns oxygen-poor blood back to the heart.

Trachea

The windpipe, it carries air from the mouth and nose to the lungs. Trachea. The trachea is a tube in your throat that helps air move to and from your lungs.

Vein

A blood vessel that carries blood to the heart. vein. A vein is a tube in the body that carries blood back to the heart.

Ventricle

One of the hearts two lower chambers, it pumps blood out of the heart. Ventricle. A ventricle is a chamber in the heart that sends blood out to the body or lungs.