4. Define a. Neuropil b. Nissl bodies a d. Purkinje fibers E. BONE AND CARTILAGE

Question

4. Define a. Neuropil b. Nissl bodies a d. Purkinje fibers E. BONE AND CARTILAGE 1. Distinguish the composition and properties of hyaline cartilage, elastic cartilage, fibrocartilage and dense connective tissue 2. Contrast the organization of spongy bone and compact bone. 3. Briefly distinguish the differences between intramembranous and endochondral ossification. F. HEART AND BLOOD VESSELS 1. Describe the structure of valves in veins, in the heart, and in lymphatic vessels. What is their function? 2. Compare and contrast the morphology of the following types of capillaries: Comntinuous capillaries 2. Fenestrated capillaries 3. Sunsoidal capillaries

Explanation / Answer

4) a. Neuropil: Neurophil is a dense network of nerve fibres, their branches synapses and glial filaments. It is composed of mostly unmyelinated axons, dendrites and glial cell processes, which creates a dense area that contain a relatively low number of cell bodies.

b. Nissl bodies: Nissl body is a large granular body found in neurons. These granules include rough endoplasmic reticulum with rosettes of free ribosomes. It is the site of protein synthesis. It also stores glycogen for energy and produce neurotransmitters.

c. Ganglion: A ganglion is a nerve cell cluster located in the autonomic nervous system and sensory system. It accommodates the cell bodies of afferent nerves and efferent nerves.

d. Purkinje fibers: Purkinje fibers are a unique cardiac end-organ and a very important component for blood circulation in humans. They receive conductive signals originating at the atrioventricular node and activate the left and right ventricles by stimulation of ventricular myocardium. They promote rapid conduction of impulse with the help of ventricles.

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