Unit 5 - H&Sc Essay

1520 Words Jun 28th, 2016 7 Pages
Homeostasis
The conditions inside the body must be controlled within narrow limits. This is called homeostasis. These conditions include water content, ion content, and body temperature and blood glucose concentration.
Homeostasis aims for normal functions and values from the body, such as temperature and blood glucose levels. When those values are either lower or higher than normal, homeostasis brings the functions back within normal values.
Internal environment
Concept of negative feedback
Homeostatic Mechanisms for regulation of the Heart Rate
Heart Rate
The medulla controls the heart rate. It sends and receives messages in the form of chemicals or hormones from the thousands of nerves running through the medulla, in an
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While the Sympathetic system is also known as the "fight or flight" response, the Parasympathetic is often called "relax and renew."
The part of the autonomic nervous system that tends to act in opposition to the sympathetic nervous system, as by slowing down the heartbeat and dilating the blood vessels. It regulates the function of many glands, such as those that produce tears and saliva, and stimulates motility and secretions of the digestive system. Compare sympathetic nervous system.
What is the cardiac control centre?
The Cardiac Control centre is located in the brain, and controls the impulses created in the heart by the Synal Atrial node as well as the impulses in the Atrioventricular node (AV node). The Cardiac Control centre therefore controls systole in the atria and ventricles, and consequently heart rate is heightened or reduced based on the commands the Cardiac Control Centre gives out.
The nervous system has a central role in controlling homeostatic mechanisms.

Homeostatic Mechanisms for regulation of

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