DSD 251 Oral Biology and Histology 2 DENTAL PULP: (Origin-Functions and Anatomy-Histology Vascularity and Lymphatic supply –Nerve supply. Regressive changes of the pulp: fibrous changes pulpal stones –diffuse calcifications) DEFINITION : The pulp is a delicate mesenchymal connective tissue that occupies the pulp cavity in the central part of tooth. The normal pulp is pink‚ coherent soft tissue is noted‚ dependent on its normal hard dentin for protection. Dentin and pulp are embryologically‚ histologically
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Chapter 5 Workfile/Study Sheet 1.What type of organisms contain biomembranes? All living organisms contain biomembranes. 2.Describe the nature of cellular membranes. Cellular membranes are fluid by nature. 3.What is the major lipid found in membranes? Phospholipids 4.What component of the cell membrane might contribute to maintaining the fluidity of the plasma membranes? Chlosterol 5.Describe globular proteins found in the membrane. They are compacted and folded Amino acids. 6.What
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such as ribosomes‚ before they mature‚ but these generally migrate to the cell wall and dissolve at maturity; this ensures there is little to impede the movement of fluids. One of the few organelles they do contain at maturity is the smooth endoplasmic reticulum‚ which can be found at the plasma membrane‚ often nearby the plasmodesmata that connect them to their companion or albuminous cells. All sieve cells have clusters of pores at their ends that grow from modified and enlarged plasmodesmata‚ called sieve
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cyton consists of cell organelles like other cells. Besides‚ it also has neurofibrils‚ neurotubules and Nissls granules or bodies. Neurofibrils take part in transmission of impulse Nissls granules or bodies are irregular masses of rough endoplasmic reticulum on which free ribosomes and polysomes are attached. Nissls granules probably synthesize protein for the cell. b) Cytoplasmic processes or neuritis – They are of two types. 1. Dendrites or dendrons - They contain neurofibrils‚ neutubules
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A bipolar cell is a type of neuron which has two extensions. Bipolar cells are specialized sensory neurons for the transmission of special senses. As such‚ they are part of the sensory pathways for smell‚ sight‚ taste‚ hearing and vestibular functions They are found in the vestibulocochlear nerve‚ but reference to bipolar neurons is usually to cells in the retina. A unipolar cell is a type of neuron in which only one protoplasmic process (neurite) extends from the cell body. Most neurons are multipolar
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is when the LDL receptor gene is not synthesized in the first place due to missense mutations in the coding regions for the protein; class 2 mutations‚ the LDL receptor protein is synthesized but does not reach the Golgi apparatus from the endoplasmic reticulum; class 3 mutations‚ the LDL receptor is not bound properly on the cell surface; class 4 mutations occur when LDL receptors do not bind and cluster in specific areas of the cell surface used for receptor-mediated endocytosis; lastly‚ class 5
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like the picture above‚ they are usually more round in comparison to a plant cell. Lysosomes also destroy any material that enter the cell and remove any cellular organelles that don’t work. Smooth ER and rough ER There are two types of endoplasmic reticulum‚ the rough ER and the smooth ER. They both have similar membranes but are presented in different shapes. The smooth ER look more like rods or tubes and the rough ER looks more like disks or sheets. (5) They are called rough and smooth ER because
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Bio112 Lecture Quiz- 10/9/2010 Answer Key 1. The scientific study of life is called: A. biology B. ecology C. anatomy D. biochemistry E. limnology 2. Human beings are _______________ because they are composed of many cell types. A. unicellular B. acellular C. asymmetrical D. autotrophic E. multicellular 3. A/an _______ is composed of a group of similar cells that perform a particular function. A. organ B. system C. organism D. tissue E. population 4. Choose the CORRECT order (1-5) of increasing
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Table of Contents Contents Page No. Task 01 1.1How Archaea is similar to Eukaryotes and how they differ from Bacteria………..02 1.2: Importance of co-ordination between sub cellular organelles in Eukaryotic cell‚ using protein synthesis and transportation within cells…….…………………04 1.3 Explain the role of different types of transporters in cell membrane……………....07 Task 02 2.1 Explain how in each stage of
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Name_______________________Period___________ Chapter 6: A Tour of the Cell Concept 6.1 Biologists use microscopes and the tools of biochemistry to study cells 1. The study of cells has been limited by their small size‚ and so they were not seen and described until 1665‚ when Robert Hooke first looked at dead cells from an oak tree. His contemporary‚ Anton van Leeuwenhoek‚ crafted lenses and with the improvements in optical aids‚ a new world was opened. Magnification and resolving power limit
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