Tag: respiratory
- Mechanics of Breathing ()
The relationship between gas pressure and volume helps to explain the mechanics of breathing. Boyle’s Law is the gas law which states that in a closed space, pressure and volume are inversely related. As volume decreases, pressure increases and vice versa. When discussing the detailed mechanics of breathing, it is important to keep this inverse […]
- The Trachea and Bronchial Tree ()
The Trachea The larynx, commonly called the voice box or glottis, is the passageway for air between the pharynx above and the trachea below. It extends from the fourth to the sixth vertebral levels. The larynx is often divided into three sections: sublarynx, larynx, and supralarynx. It is formed by nine cartilages that are connected […]
- Even More Threats To Perfusion ()
Peripheral Vascular Resistance Peripheral vascular resistance (systemic vascular resistance, SVR) is the resistance in the circulatory system that is used to create blood pressure, the flow of blood and is also a component of cardiac function. When blood vessels constrict (vasoconstriction) this leads to an increase in SVR. When blood vessels dilate (vasodilation), this leads […]
- More Threats To Perfusion ()
Ventilation To Perfusion (Q/V) Mismatch One of the major roles of the lungs is to facilitate gas exchange between the circulatory system and the external environment. The lungs are composed of branching airways that terminate in respiratory bronchioles and alveoli, which participate in gas exchange. Most bronchioles and large airways are part of the conducting zone […]
- Pediatric vs Adult Anatomy ()
A child’s physiology and anatomy is different in many ways from an adult. When a baby is born there are still gaps in the bones of the skull. The shape of the head can therefore be altered by constant pressure on it especially if the baby is always lying the same way in a bed. […]
- Respiratory System – More Structures ()
The phrenic nerve originates from the spinal cord at C3 through C5 and traverses the neck, heart, and lungs to reach the diaphragm and terminate into right and left branches at the subclavian artery. The left phrenic nerve innervates the left diaphragmatic dome, and the right phrenic nerve innervates the right diaphragmatic dome, with 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 […]