18: The Cardiovascular System: The Heart You should be able to speak intelligently to all of these‚ but the bolded objectives are test material. Objectives Heart Anatomy 1. Describe the size‚ shape‚ location‚ and orientation of the heart in the thorax. 2. Name the coverings of the heart. 3. Describe the structure and function of each of the three layers of the heart wall. 4. Describe the structure and functions of the four heart chambers. Name each chamber and provide
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Citrus Diseases Citrus Canker Citrus canker is a highly contagious bacterial infection of citrus trees causing yellow halo-like lesions or scabs on the fruit‚ leaves and twigs of citrus trees. Severe infections can cause leaf loss‚ blemished fruit‚ fruit drop and die back. The canker bacterium spreads easily and quickly on air currents‚ insects‚ birds and on humans by means of clothing and infected implements. There are a variety of sprays designed to protect against infection including using
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Congestive Heart Failure Congestive heart failure is an older name for heart failure. Congestive heart failure takes place when the heart is unable to maintain an adequate circulation of blood in the bodily tissues or to pump out the venous blood returned to it by the veins (Merriam-Webster). The heart is split into two distinct pumping structures‚ the right side of the heart and the left side of the heart. Appropriate cardiac performance involves each ventricle to extract even quantities of blood
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Heart Valve Transplants The heart‚ the most important organ in the body‚ plays a vital role in a supplying the body with all of the nutrients needed. Not only does the heart pump blood through the body‚ but it also carries oxygen to help the body function correctly and it allows for the removal of waste product. Because the heart is so essential to human body‚ its structure and function is equally as important. The heart is designed to pump blood through its chambers. The top two chambers
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During exercise your body must adapt to the added stress and pressure you are putting onto it. The heart plays a very important role in maintaining homeostasis during exercise. When exercising your heart rate increases and the “Left Heart” have to pump out more oxygenated blood to the entire body. The sympathetic nervous system also plays an important role during exercise. The sympathetic pathway comes out of the lower cervical and upper thoracic segments of the spinal cord. The sympathetic
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Homeostasis of BP and Heart Rate A normal blood pressure can be identified by having a systolic pressure of around 120 and a diastolic pressure of around 80. This value is expressed as "120/80". A normal heart rate is expressed as the amount of times it beats in a minute; a normal adult heart rate is between 60-100 beats per minute (BPM). There is a relation between these two measurements‚ but they are stimulated by several different circumstances. The blood pressure is mainly affected
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carries oxygenated blood away from the heart. It supplies the brain‚ right arm‚ and neck with blood. Common carotid artery: The common carotid artery supplies oxygenated blood to the front of the brain as well as the head‚ neck‚ face‚ and spinal cord. Subclavian artery: The subclavian artery carries blood away from the heart and supplies oxygenated blood to the arms. Left pulmonary vein: The left pulmonary vein carries oxygenated blood from the left lung to the heart. Right pulmonary vein: The right
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A congenital heart defect (CHD) is an abnormality in the structure or function of the heart. This can include circumstances that affect the walls of the organ‚ blood vessels that transport blood to and from it‚ and the valves that regulate blood flow. Some CHDs are minor‚ and cause no noticeable symptoms. Others are severe‚ and can place the patient’s life at risk. Symptoms vary according to the type of defect suffered‚ as well as its severity. In this article‚ we’ll explore a few of the most common
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spread to the lining of the heart‚ which causes pericarditis. The infection can be caused by wounds that are left untreated or a weak immune system that just can’t fight off simple ailments‚ but it is most commonly caused by teeth problems‚ such as rotten teeth or gingivitis. The bacteria in the mouth quickly spreads to the blood system when a person eats food. And when it gets to the blood system‚ it is carried to the heart. This in turn makes the lining of the heart inflamed. If this condition
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INTRODUCTION Attention Getter: Have you ever thought of how your heart beats everyday tirelessly without stopping and how it pumps blood throughout the body? Well here is how it works.. Psychological Orientation:. As I started researching information about the different functions of the heart‚ I realized I didn’t know much about how our heart really works and why is it important to our body. So‚ I did significant research to educate myself. Logical Orientation: As students many of us have to know
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