The main transport system of human is the circulatory system, a system of tubes (blood vessels) with a pump (the heart) and valves to ensure one-way flow of blood. This circulation also reduces the pressure in the lungs, and it ensures that the oxygenated blood and deoxygenated blood do not mix. Blood usually consists of a fluid medium known as plasma where the cells remain suspended. The tubes refer to the blood vessels which transport blood throughout the body, while the medium is the blood or lymph. Red blood cells are biconcave shaped. Phagocytes have a lobed nucleus, and they are responsible for the cell-eating action known as phagocytosis. Fibrin, along with blood cells make a mesh, forming a scab. Red blood cells are biconcave shaped. The cardiac muscle contracts with a lot of force, squeezing inwards on the blood inside the heart and pushing it out. There are two types of circulatory systems: Blood passes through the heart only once in a single circulation. Introduction. A cell is the smallest unit that can carry on all the processes of life. The right ventricles of the heart have thinner muscle walls compared to the left ventricle. GCE O Level Biology Tuesday, December 23, 2008. About Biology: Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, and taxonomy. These are vessels carrying blood from the tissues towards the heart. 7.1 Circulatory system . This seals the wound, known as a clot. The left ventricle needs more pressure as it pumps blood all around the body. The tricuspid valve opens and lets the blood flow into the right ventricle. The lymphatic system is an extension of the human circulatory system that includes cell … The right ventricle needs less pressure because they send blood to the lungs only, and the distance between the heart and the lungs is short. They also have semilunar valves to prevent the backflow of deoxygenated blood. The walls are also elastic so that they can stretch and recoil, helping to push blood along the artery in spurts. Content . On the other hand, lymphocytes do not have a lobed nucleus. Arteries carry blood away from the heart while veins carry blood back to the heart. When aorta comes out of the heart, it makes two branches. It takes blood around the body. Enzymes; 4. It is composed of a pump, a network of closed tubes, and a medium. These branches are known as coronary arteries. Biology Notes - Transport in humans. The atrial walls are not as thick as the ventricular walls. Visit. It comprises of blood cells, soluble nutrients, hormones, glucose, carbon dioxide, and mineral ions. Other than those, it maintains the shape and rigidity of the heart, providing strength to the walls of the heart. Cells give out waste products, for example, carbon dioxide, to the capillary at B. The gills will supply oxygenated blood to the whole body. Phagocytes identify the foreign antigen and engulf it by making an invagination in the cell membrane. 2. The nucleus is absent to increase the surface area for the transport of oxygen. The blood is responsible to transport food, oxygen, and waste materials in human bodies. Get Biology O Level Notes here at my new website. However, oxygen is carried by the red blood cells. Fibrinogen is an inactive, soluble protein that is converted into fibrin, which is insoluble, thread-like structures. The lungs oxygenate the blood through the gaseous exchange. The diagram below shows the transfer of materials between capillaries, lymph capillaries and tissue fluid. 1. These are vessels carrying blood away from the heart to the tissues. Blood comes out immediately after a blood vessel is cut. 3. ... Transport In Humans. You also have higher chances of getting heart disease if it runs in your family. Topics that are covered include 1. It is a muscular wall that separates the left and the right side of the heart. The blood is responsible to transport food, oxygen, and waste materials in human bodies. GCE O Level Biology Friday, December 26, 2008. They have a large surface area for the exchange of substances. Describe what happens at points A and B. Biology Notes For O-level Cell Structure and Organization. Newer Post Older Post Home. 7.1 The Heart. What is the purpose of a circulatory system? ensure one-way flow of blood. There are four methods for its treatment, as stated below: They transport oxygen to body tissues as they have a special protein, known as hemoglobin. Platelets are remnants of cytoplasm. It also helps in the prevention of mixing of deoxygenated and oxygenated blood. The valve between the right atrium and the right ventricle has three flaps, thus known as the tricuspid valve. Hemoglobin is an iron-containing pigment that picks up oxygen in the lungs and lets go of it at the tissues. WBCs are nucleated cells of two types. The oxygenated blood then goes back to the heart which pumps it to all the organs and tissues in the body. You can find notes and exam questions for Additional math, Elementary math, Physics, Biology and Chemistry. Our notes have been written and reviewed by qualified teachers.Along with the notes you can also find the latest Past Papers and other resources that includes syllabus, specimens, marking schemes, students’ guide, … • To transport _____and _____. A valve ensures the one-way flow of the blood. To remove waste and carbon dioxide from. We need a transport system to deliver oxygen, nutrients and other substances to all our body cells, and take away waste products from them. The ventricles then pump it out of the heart by contracting the muscle in their walls. It is a fluid that carries all the blood components. The vein that carries deoxygenated blood from the lower parts of the body going towards your heart is known as. The gaseous exchange takes place in the gills, making the blood oxygenated. Veins also contain less elastic tissue. The deoxygenated blood is in the right atrium. Pacific Medical Training's Medical Learning Library provides a useful description and explanation about the human heart.
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