Circulatory Systems link exchange surfaces with cells throughout the body Diffusion is too slow of an exchange system for large organisms Gastrovascular Cavities Fluid bathes both the inner and outer layers This facilitates exchange between both layers easily‚ as a sort of bridge Evolutionary Variation of Circulatory System Diffusion distance was too great of a problem Three components: Fluid Interconnecting vessels Heart Open and Closed Circulatory Systems Arthropods and most molluscs
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The circulator system of spiders * Spiders are arthropods and they have an open circulatory system. * The open circulatory system is a system in which the organs are directly bathed with nutrients and oxygen. The blood flow is not restricted as much as a closed circulatory system. * The spider’s heart is a simple heart‚ a tube surrounded by muscle with a one-way valve at each end. * It is located in the abdomen a short distance within the middle line of the dorsal body-wall‚ and
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closed circulatory system of some mollusks and all higher invertebrates and the vertebrates is a much more efficient system. Here blood is pumped through a closed system of arteries‚ veins‚ and capillaries. Capillaries surround the organs‚ making sure that all cells have an equal opportunity for nourishment and removal of their waste products. However‚ even closed circulatory systems differ as we move further up the evolutionary tree. One of the simplest types of closed circulatory systems is found
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1.*The primary function of the circulatory system is to transport nutrients‚ gases‚ hormones and wastes throughout the body. A. True B.False **Ans.A 2. *The Interventricular septum the heart prevents blood from flowing from the right to the left sides of the heart. A. True B.False **Ans.A 3. The valves are flaps that are located on each end of the two ventricles of the heart. A. They prevent blood from flowing backwards. B.They prevents blood from flowing forwards. Ans
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CARDIOVASCULAR SYSTEM The Cardiovascular system consists of the cardio -heart and the vessels that carry blood to all parts of the body. If this system does not work properly then oxygen‚ hormones‚ water‚ nutrients and wastes won’t reach their target destinations. 5 liters of blood in body. BLOOD Blood is a fluid connective tissue and Plasma is the matrix that separates the red and white blood cells and the platelets from one another. Plasma also transports dissolved substances such
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The Circulatory System The Circulatory System is designed to deliver oxygen and nutrients to all parts of the body and pick up waste materials and toxins for elimination. This system is made up of the heart‚ the veins‚ the arteries‚ and the capillaries. Circulation is achieved by a continuous one-way movement of blood throughout the body. The network of blood vessels that flow through the body is so extensive that blood flows within close proximity to almost every cell. Heart The heart
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________________________ Student Exploration: Circulatory System Vocabulary: artery‚ atrium‚ blood vessel‚ capillary‚ circulatory system‚ heart‚ platelet‚ pulmonary artery‚ pulmonary vein‚ red blood cell‚ urea‚ ventricle‚ vein‚ white blood cell Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Why do you need blood? __Blood carries oxygenon and nutrients around you body.___________________________________________________ 2. What organ pushes blood through your body? ______The heart_____________
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4 CIRCULATORY SYSTEM The circulatory system contains several very different components‚ including the heart‚ a hollow muscular pump that stands at the operational center of the system that pumps liquid blood throughout the body through three types of flexible tubes‚ the blood vessels (Fig. 4.1). The arteries channel blood from the heart to all parts of the body needing service. Once there‚ the blood passes through narrow arteries and enters the capillaries‚ which are the narrowest blood vessels
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The Respiratory‚ Circulatory‚ Skeletal‚ Nervous‚ Digestive and Endocrine are the body systems. The Circulatory system has a disease that is very common.Which is called Peripheral Artery Disease. Peripheral Artery Disease or P.A.D. is something that causes plaque buildup in the arteries that carries blood to the head‚ organs‚ and limbs. P.A.D. affects the body from blocking the blood flow or slowing it down. It is more known in people older than 50. The disease is caused by a condition known as
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Bio 104-03 Lab #3- Acids Bases‚ and Buffers 1. An acid is a substance that releases hydrogen ions as they desolve in water and ranks lower than seven on the pH scale. An example of an acidic substance is lemon juice. A base is a substance that accepts hydrogen ions and ranks higher than seven on the pH scale. An example of a base substance is hand soap. A neutral substance ranks a seven on the pH scale and has equal concentrations of H+ and OH-. An example of this is pure water. Electrolytes
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