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Bio12 Respiratory
SLS Bio 12 Respiratory (R.L.)
Term | Definition |
---|---|
Alveoli | Microscopic sac like endings of the bronchioles, forming the lungs. It is through their surfaces that gas exchange for external respiration occurs. |
Aortic bodies | One of several small clusters of chemoreceptors, baroreceptors, and supporting cells located along the aortic arch. |
Bicarbonate ions | Dissociation products of particular salts such as sodium bicarbonate and carbonic acid. The bicarbonate ions acts as buffer. |
Bronchi | The branches of the trachea that conduct air to and from the lungs. They are protected from collapse by cartilaginous rings. |
Bronchioles | The branches of the bronchi. The bronchioles continue to branch into smaller and smaller passageways finally ending at alveoli. |
Carbaminohemogloblin | The combination of carbon diode and hemoglobin. Second most common way that carbon dioxides transported safely in plasma. |
Carbon dioxide | A toxic by product of cellular respiration that is removed from the body by the respiratory system. |
Carbonic anhydrase | An enzyme located in the membrane of red blood cells. The enzyme catalyzes the reversible reaction between H20 and CO2 forming carbonic acid. |
Carotid bodies | A small mass of receptors in the carotid artery sensitive to chemical change in the blood. |
Cilia | Short hair-like structures made from 20 molecules of the protein tubulin. |
Diaphragm | The sheet-lie muscle at the base of the thoracic cavity. Contraction of the diaphragm causes it to flatten out from its normal arched shape. |
Exhalation | Breathing out, also termed expiration. |
External respiration | Refers to gas exchange (diffusion) across the alveoli surfaces. |
Hydrogen ions | Protons. When hydrogen ionizes, it loses its electron and gains a positive charge. The measure of the hydrogen ion concentration can be used to determine the pH of a solution. |
Inhalation | Breathing in. |
Intercostal muscles | The smooth muscles tissue lying between the ribs. |
Internal respiration | Gas exchange at the systemic capillaries beds. |
Larynx | Voice box. The larynx is the first actual structure of the trachea. |
Lungs | Organs of the gas exchange for the respiratory system. |
Mucus | A watery fluid secreted by mucosal cells. Mucus is used as a lubricant and a protectant. |
Nasal cavity | The sinus chamber at the top of the nostrils. It is the main entry point for air into the respiratory pathway and is kept moist with mucus. |
Oxygen | A diatomic gas found in nature making up about 21% of the atmosphere. |
Oxyhemoglobin | The combination of oxygen and hemoglobin. |
pH | A measure of the amount of hydrogen ions in a solution. If a solution is neutral, it has a pH of 7.0. |
Pharynx | The region at the back of the mouth where both food and air travel.` |
Pleural membrane | The double layer of membranes that surround the lungs. The outer pleural membrane is on the inner wall of the thoracic cavity and along the top of the diaphragm. |
Reduced hemoglobin | Hemoglobin that is transporting hydrogen ions. |
Respiratory centre in the medulla oblongata | The part of the brain that monitors the blood and signals the contraction of the diaphragm and intercostals muscles causing inhalation. |
Respiratory tract | The pathway of airflow in the body associated with respiration. |
Ribs | A series of curved bones that are articulated with the vertebrae and occur in pairs, 12 in humans |
Stretch receptors | A type of nerve receptor that is sensitive to stretch. Stretch receptors are located on the surface of alveoli. |
Thoracic cavity | Chest cavity. Contains the lungs and the heart. Its lower limit is the diaphragm. |
Trachea | Windpipe. The trachea is the cartilaginous ringed tube that conducts air up and down the neck. |