Category: EMT
- Blood Vessels ()
Blood vessels are the channels or conduits through which blood is distributed to body tissues. The vessels make up two closed systems of tubes that begin and end at the heart. One system, the pulmonary vessels, transports blood from the right ventricle to the lungs and back to the left atrium. The other system, the […]
- How Oxygen Gets Into Your Body From The Environment ()
Our lungs are among our largest vital organs. The oxygen you breathe in goes into your lungs and passes into your blood from there. It is then transported to all the cells in your body through your bloodstream. The lungs are located in the chest region, protected by the ribs in the rib cage. Their […]
- How does the blood circulatory system work? ()
The blood circulatory system (cardiovascular system) delivers nutrients and oxygen to all cells in the body. It consists of the heart and the blood vessels running through the entire body. The arteries carry blood away from the heart; the veins carry it back to the heart. The system of blood vessels resembles a tree: The […]
- Circulatory System Structure ()
The heart is a muscular pump that provides the force necessary to circulate the blood to all the tissues in the body. Its function is vital because, to survive, the tissues need a continuous supply of oxygen and nutrients, and metabolic waste products have to be removed. Deprived of these necessities, cells soon undergo irreversible […]
- Mechanics of Ventilation ()
Ventilation, or breathing, is the movement of air through the conducting passages between the atmosphere and the lungs. The air moves through the passages because of pressure gradients that are produced by contraction of the diaphragm and thoracic muscles. Pulmonary ventilation is commonly referred to as breathing. It is the process of air flowing into […]
- Respiratory System – Airway ()
The pharynx, commonly called the throat, is a passageway that extends from the base of the skull to the level of the sixth cervical vertebra. It serves both the respiratory and digestive systems by receiving air from the nasal cavity and air, food, and water from the oral cavity. Inferiorly, it opens into the larynx […]
- Muscular System ()
The muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction. Exceptions to this are the action of cilia, the flagellum on sperm cells, […]
- Joints And Articulations ()
An articulation, or joint, is where two bones come together. In terms of the amount of movement they allow, there are three types of joints: immovable, slightly movable and freely movable. Synarthroses are immovable joints. The singular form is synarthrosis. In these joints, the bones come in very close contact and are separated only by […]
- Skeletal System ()
Skull Cranial Bones Parietal (2) Temporal (2) Frontal (1) Occipital (1) Ethmoid (1) Sphenoid (1) Maxilla (2) Zygomatic (2) Mandible (1) Nasal (2) Platine (2) Inferior nasal concha (2) Lacrimal (2) Vomer (1) Vertebral Column Cervical vertebrae (7) Thoracic vertebrae (12) Lumbar vertebrae (5) Sacrum (1) Coccyx (1) Pectoral girdles Clavicle (2) Scapula (2) Upper Extremity […]
- Anatomical Terms ()
Directional terms Directional terms describe the positions of structures relative to other structures or locations in the body. Directional terms are used solely for comparison. Superior or cranial – toward the head end of the body; upper (example, the hand is part of the superior extremity). Inferior or caudal – away from the head; lower […]