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Tina J
SCI221-05 Human Physiology Week 7-13
| Term | Definition |
|---|---|
| Resting membrane potential (RMP) | The membrane potential maintained by a nonconducting neuron’s plasma membrane. |
| Hyperpolarization | Movement of the membrane potential away from zero. |
| Falx cerebri | Projects downward into the longitudinal fissure to form a kind of partition between the two cerebral hemispheres. |
| Ventricles | The four large, fluid-filled spaces within the brain. |
| Sciatic nerve | In the thigh, they form the largest nerve in the body. |
| Dermatome | Each skin surface area supplied by sensory fibers of a given spinal nerve. |
| Postganglionic neuron | Second neuron conducts impulses away from the ganglion and to the effector. |
| Norepinephrine | Axon terminals of autonomic neurons release either of two neurotransmitters. |
| Adaptation | The process by which the magnitude of the receptor potential decreases over time in response to a continuous stimulus. |
| Somatic senses | The senses of which we are usually consciously aware. |
| Gustatory cells | Each taste bud is like a banana cluster that contains 50 to 125 of these chemoreceptors. |
| Otoscope | Used to examine the external ear canal and outer surface of the tympanic membrane. |
| Neuroendocrine system | Each system may work alone, or they may work in concert with each other as a single. |
| Tropic hormones | Hormone molecules can be classified in various useful ways. |
| Down-regulation | The number of receptors, and thus the sensitivity of the target cell, go down, this phenomenon. |
| Follicle-stimulating hormone (FSH) | Stimulates structures within the ovaries, primary follicles, to grow toward maturity. |
| Oxytocin | It stimulates rhythmic contraction of smooth muscles in the uterus, and it causes milk ejection from the breasts of lactating women. |
| Anemias | Conditions that result in decreased RBC numbers. |
| Erythropoiesis | The entire process of RBC formation is a type of hematopoiesis. |
| Serous pericardium | Within the fibrous pericardium is a double layer of smooth, moist serous membrane. |
| Fibrous pericardium | Tough, loose-fitting, and inelastic sac around the heart |
| Capillaries | Are the microscopic vessels that carry blood from arterioles to venules. |
| Muscular arteries | Carry blood farther away from the heart to specific organs and areas of the body. |
| Perfusion pressure | This local pressure gradient needed to maintain blood flow in a tissue. |
| Cardiac output (CO) | The amount of blood that flows out of a ventricle of the heart per unit of time. |
| Lymphangiography | This method of visualizing lymphatic vessels. |
| Tonsillectomy | They are sometimes removed surgically if antibiotic therapy is not successful or if swelling impairs breathing. |
| Nonspecific immunity | Includes mechanisms that resist a wide variety of threatening agents or conditions, innate immunity. |
| Antigens | These molecular markers visible to the immune system. |
| Cytokines | The chemical messengers released by T cells. |
| Lymphotoxin | Powerful poison that acts more directly, quickly killing any cell it attacks. |
| Pulmonary ventilation | A technical term for what most of us call breathing. |
| Elastic recoil | The tendency of the thorax and lungs to return to their preinspiration volume is a physical phenomenon |
| Spirometer | Used to measure the volume of air exchanged in breathing |
| Partial pressure | The pressure exerted by any one gas in a mixture of gases or in a liquid. |
| Chloride shift | This counter transport of negative ions. |
| Haldane effect | Refers to the increased total CO2 loading caused by a decrease in Po2. |
| Mucosa | The innermost layer of the GI wall the layer facing the lumen, or open space, of the tube. |
| Ingestion | To accomplish the function of making nutrients available to each cell of the body, the digestive system uses various mechanisms. |
| Retropulsion | The pyloric sphincter remains closed most of the time, the chyme is forced to move backward. |