Anatomy and Physiology of Special Sensory Organs
Sensory organs can be labeled as special sensory structures that permit sight, hearing, odor, and flavor. Sensory structures permitting proprioception, touch, thermal, and pain perception can be classified as more advanced sensory organs. The sensory neurons are trained to find out modifications in the external and internal conditions so that a person's body can react to that change. A stimulus is the first signal that is recognized by any sensory receptor of the body. Stimulus is an impulse generated when there is a change in the surroundings of a person. For example, a heated environment will alert the brain through the thermal sensory organs and generate a reflex accordingly.
Sensory Receptors
The human sensory system is one of the most complex and highly evolved structures, which processes a myriad of incoming messages. This well-coordinated system helps an organism or individual to respond to external stimuli, appropriately. The sensory receptors are an important part of the sensory system. These receptors are specialized epidermal cells that respond to external environmental stimuli. These receptors consist of structural and support cells that form the peripheral unit of the receptor and the neural dendrites which receive and detect the external stimuli.
Platelets : These are the cells which are involved in the clotting of blood, that stops the bleeding. Stem cells found in Red bone marrow, differentiate into different types of cells that forms all type of cells found in the blood.
Platelets, also known as thrombocytes, are blood cells. They build up in your bone marrow, sponge-like tissues in your bones. Platelets play a major role in blood loss. Usually, when one of your blood vessels is damaged, it begins to bleed. Your platelets will turn (connect) to close the hole in your blood vessels and stop the bleeding.
Platelets play an important role in the ark. Following its formation from megakaryocytes, platelets are present in a 5-7-day cycle and primarily act as regulators of hemostasis and thrombosis. After trauma or damage to the arteries, platelets begin to work in the bloodstream leading to adhesion to the extracellular matrix below the endothelium, platelet platelet formation, and finally to the formation and integration of a thrombus that connects both the nucleus and the shell. In pathological cases, platelets are important in the formation of occlusive thrombus and therefore are the main purpose of preventing the formation of arterial thrombus.
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