Baroreceptors

Words: 1780

Pages: 8

Open Document

Trigger: You and your two friends work out a system to cheat on your physiology test. (DO NOT DO THIS. This is strictly a make believe story.) The genius friend says she will put one finger on your back for A and two for B. You feel one finger and mark down A and get the question wrong, however your friend feels two and answers correctly. You both were touched in the same location with the same intensity and duration. Why did you misinterpret the touch and your friend didn’t? Explain using a mechanistic explanation. (LG: 4,5,6)
When you someone touches your back with the minimum stimulus to activate a receptor, this causes the mechanoreceptors on your skin to fire, or specifically your baroreceptors. Once these receptors have received a signal this changes the membrane potential of the cell and causes an action potential. Due to modality and location the brain interprets a signal coming from your back as a touch and coming from that certain location. The reason your friend and yourself did not interpret the same stimulus will be due to the …show more content…
Norepinephrine, which is released by your SNS, increases ion flow through the If and aalcium channels in the autorythmic cells which are found in the SA node. More rapid cation entry into the autorythmic cells speeds up the rate of the depolarization allowing the cell to reach threshold faster which in turn increases the rate of action potentials firing. When these action potentials increase this spreads to the contractile cells through gap junctions which in turn causes them to contract at a faster rate, increasing heart rate. When heart rate increases this will increase the cardiac output due to the relationship HRxSV=CO. When you increase cardicac output you also increase pressure because cardiac output is directly proportional to pressure. Therefore when B1 receptors are activated on the SA node the immediate affect is an increase in pressure.

Baroreceptors In The Cardiovascular System

autonomic nervous system through mechanoreceptors on the arterial walls of the carotid arteries and the aorta. These mechanoreceptors are called baroreceptors and they send signals to the brain to keep a regulated blood pressure. Along with baroreceptors, blood pressure is maintained through a system of homeostasis called the baroreceptor reflex. This baroreceptor reflex is the cardiovascular control center in the brain stem that tries to retain blood pressure at persistent levels by generating a swift…

Words 850 - Pages 4

Hypertension: Hypertension and Blood Pressure Rises Essay

rate, blood vessel dilation, water balance, ambient temperature, metabolic rate, respiratory rate, detoxification, hormones, blood sugar levels, and disease all have to be in homeostatic balance in order to maintain normal blood pressure. The baroreceptor reflex is the quickest acting mechanism that homeostasis uses to regulate blood pressure. The adrenal gland also acts fast by secretion of epinephrine and norepinephrine. If long term control is needed the reninagiotensin-aldosterone mechanism…

Words 422 - Pages 2

Mandatory Synthesis Essay

Exercise results in consumption of oxygen to produce ATP for the body, which leads to the buildup of CO2 and water as the metabolic waste products. The CO2 can react with water to produce carbonic acid and later H+ ions (Wasserman et al, 1967). This lowers the pH of the body leading to acidosis. The normal body pH is around 7.4, and any deviation from that can cause denaturation of the enzymes and negatively affect the functions of the body. If oxygen is not available during this stage to compensate…

Words 335 - Pages 2

Syphilis Research Paper

Syphilis is a sexually transmitted disease (CDC). Syphilis is spread by direct contact from person to person (CDC). The disease is transmitted to another person by contact with a syphilis sore, or chancre (CDC). The disease can be passed along via vaginal, oral, or anal sex (CDC). Babies can also be born with syphilis if their mother was infected and didn’t receive treatment during pregnancy (CDC). Syphilis was introduced into this world in the late 1400’s (Frith). There were many names for this…

Words 2095 - Pages 9

Exam 1 Physiology Study Guide Essay

cells Aldosterone stimulates K+ secretion in the distal tubule, increases sodium reabsorption into bloodstream, increases water reabsorption, increases blood pressure Increases blood pressure in the distal tubule Low blood pressure is sensed by baroreceptors in juxtaglomerular apparatus Cells of JGA secrete renin into afferent arteriole Angiotensinogen…

Words 1359 - Pages 6

Hypertension, Diabetes Essay

Diabetes Diabetes is a group of metabolic diseases in which a person has high blood sugar. Classic symptoms of diabetes are frequent urination, increased thirst, and increased hunger. There are three main types of diabetes. Type one, type two, and gestational diabetes. Type one diabetes targets younger people. Type one diabetes is partly inherited and then triggered by certain infections. It results in the bodys failure to produce insulin. The result is people have to get insulin shots to regulate…

Words 433 - Pages 2

Arteries Essay

Chapter 21 BLOOD VESSELS & HEMODYNAMICS THERE ARE 5 MAIN TYPES OF BLOOD VESSELS Arteries Arterioles Capillaries Venules Veins Arteries carry blood away from the heart. Large elastic arteries leave the heart and divide into muscular medium sized arteries that branch out into the body. Muscular arteries then divide into small arteries that divide into smaller arterioles. Arterioles in some tissue then divide into capillaries. Gas and nutrient exchange occurs in the thin…

Words 4970 - Pages 20

Heart Notes Essay

Heart Part 2 Heart beat is controlled by Autonomic Nervous System * Cardiac center in medulla oblongata (in brain stem) Cardio-acceleratory center | Cardio-inhibitory center | - Innervates SA and AV nodes, heart muscle and coronary arteries with sympathetic neurons | - Inhibits SA and AV nodes with parasympathetic fibers in vagus nerves | Vasomotor center in Medulla Pressor area: increase blood pressure via vasoconstriction Depressor area: decreases blood pressure by inhibiting…

Words 1788 - Pages 8

Circulation And Blood Flow

Circulation & Blood Pressure || Blood Pressure | Resistance | Capillary Exchange | Change in active tissues|| Interaction b/w cardiac output and capillary blood flow depends on Pressure, P, and Resistance, R. Inc. Pressure = Inc. Flow, and Inc. Resistance = Dec. Flow Pressure gradient is the difference in Pressure from one end of the vessel to the other Mean blood pressure decreases as you move away from the heart Resistance in the Venous system is very small and is thus able to return blood to…

Words 804 - Pages 4

Essay about Cardiovascular: Blood and Cardiac Output

Cardiovascular Fitness Kaye Pierce Personal Fitness 5th period Coach Mills November 24, 2012 Cardiovascular Fitness Cardiovascular fitness also known as cardiorespiratory fitness is the ability of the heart and lungs to supply oxygen-rich blood to the working muscle tissues and the ability of the muscles to use oxygen to produce energy for movement. This type of fitness is a health-related component of physical fitness that is brought about by sustained physical activity. A person’s ability…

Words 703 - Pages 3