Platelets in Blood
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Platelets, also called thrombocytes, are fragments of cell cytoplasm that help form blood clots. They prevent excessive bleeding by forming a physical barrier at the site of an injury. When tissue is damaged, platelets and thrombokinase are released, starting a process where prothrombin is converted to thrombin and fibrinogen is converted to fibrin threads, forming a mesh that seals the wound. Blood transports oxygen, nutrients, waste, hormones, and more between organs and tissues using red blood cells, white blood cells, plasma, and platelets as key components.
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Transport in Human documents the main components of the human circulatory system including arteries, veins, capillaries, and the layers that make up blood vessels. It discusses that arteries carry oxygen-rich blood away from the heart to tissues, veins carry oxygen-depleted blood back to the heart, and capillaries allow for gas exchange. The inner layer of blood vessels is made of smooth muscle, the middle layer contains smooth muscle tissue, and the outer layer comprises flexible connective tissue. The document also relates the components of blood - plasma, red blood cells, white blood cells, and platelets - to their functions in carrying oxygen, nutrients, hormones, fighting infection, and clotting.
Physiology.pptx
Physiology. Anatomy
The Science of Life: An In-Depth Physiology Overview.
Physiology in Action: How Your Body Functions
Human body systems for kids
The document provides an overview of the main human body systems for 7th grade science students. It includes pages on the skeletal, muscular, digestive, circulatory, respiratory, excretory, nervous, endocrine and reproductive systems. Each page contains 2-3 sentences summarizing the key functions and components of that system. The pages also include buttons to navigate between them and try a review question at the end.
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Anatomy & Physiology Lecture Notes - Ch. 3 cells - part 3
Anatomy & Physiology Lecture Notes - Ch. 3 cells - part 3
Platelets in Blood
- 1. Platelets/thrombocytes Not cells but are fragments of cytoplasm of cells Functions: involved in clotting of blood which seals a wound: prevents excessive bleeding stops foreign particles/organisms from entering blood stream by forming a physical barrier
- 2. Mechanism of blood clotting Damaged tissues & platelets release thrombokinase (enzyme) prothrombin thrombokinase thrombin (inactive enzyme) Ca2+ ions (active) soluble fibrinogen insoluble fibrin protein threads forms a mesh
- 3. Functions of blood components: Red blood cells Transport oxygen which combines with haemoglobin White blood cells Engulf and ingest foreign particles; antibody formation Platelets Helps in blood clotting Plasma Transport of: - Blood cells - Hormones - Food substances (glucose, amino, acids, fats, vitamins) - Waste products (carbon dioxide, urea)
- 4. Transport Function of Blood transports transports digested excretory oxygen hormones heat food products from to (insulin,..) from to from lungs all cells small all respiring from intestine cells from to respiring tissues dissolved organs target urea CO2 that organ(s) from to produced from to it All cells, esp liver kidney all cells lungs