4 major types of cells that can be found in the skin. The 4 major types of cells that are found in the human body are keratinocytes‚ melanocytes‚ epidermal dendritic (Langerhans)‚ and the tactile (Merkel) cells. The keratinocytes‚ which are epithelia cells‚ are the most abundant cells in human body and dominate the epidermis. These cells contain keratin and work together to form layers known as thick skin‚ which consists of 5 layers‚ and thin skin‚ which consists of 4 layers. These cells are in the
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Evolution of Skin Pigmentation due to UV Levels and Genes Introduction Identification of a person has long been related to the color of their skin‚ as skin color is the defining measure of races. There are multiple variations in skin color throughout the globe‚ with the differences in outward appearance ranging from dark to light. But what exactly has caused this to occur? What is the underlying event that has led to so much variation in the pigmentation of a person? What selection pressures
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Exercise 8 Simple Muscle Contraction • 3 Phases AB - lag phase or latent phase - (shortest) 0.00sec‚ usually less than 0.01sec - brief period that exists between the application of the stimulus and the start of contraction BC - contraction‚ 0.05sec - peak - shortening of the muscle occur CD - relaxation period‚ 0.05 sec - Occurs when Ca+ is transported back in the sarcoplasmic reticulum Single muscle contraction= 100vib/sec (tuning fork)= 0.10 sec 10vib (result) Neuromuscular junction - formed when
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Aging of the human skin Enlarged version The formation of lines and wrinkles in light-exposed areas throughout the body‚ such as on the face‚ throat‚ décolleté and hands is a well-known sign of skin aging. Lines and wrinkles are influenced by both intrinsic and extrinsic factors. The numerous intrinsic factors are age‚ gender‚ genetic disposition and race. In exposed and unprotected zones of the body such as on the skin of the hands and the face‚ extrinsic factors such as UV light‚ weather
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forest‚ a forensic anthropologist will need to examine it. However‚ if more bones were found there may be a more useful bone‚ or combination of bones‚ that would be more likely to provide pertinent information. There are many things that can be found out from a human femur‚ when it is first found and proved to be human anthropologists can use different observations‚ measurements and analysis techniques to categorise the bone and build up a biological profile of the individual. Some things that can
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Skeletal Muscle Lab Introduction: Motor neurons and muscle fibers are the building blocks of motor units and where they intersect is called the neuromuscular junciton. The region where the flattened end of a motor neuron transmits neural impulses to a muscle is the motor end-plate. The end plate potentials depolarizes skeletal muscle fibers caused by neurotransmitters binding to the postsynaptic membrane in the neuromuscular junction. The process of contraction of the muscle cell is called excitation-contraction
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A muscle is a group of cells called fibers‚ and are generally quite big. One muscle fiber has a large amount of myofibrils‚ which are muscle proteins in the shape of cylinders. These myofibrils contain two different types of filaments‚ which run along the axis of the fiber in hexagonal patterns. The two types of filaments are thick and thin filaments. Every thick filament is surrounded by six thin filaments. Both thick and thin filaments are attached to a structure called the Z-line. The Z-line runs
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Treating skin cancer is best done as soon as you notice a change in your skin. In choosing a treatment option‚ your doctor will consider the type and size of cancer and where it is on your body. The type of treatment will also depend on whether the skin cancer has spread anywhere else on your body. Skin cancers are almost always removed. In more serious cases of skin cancers the tissue around the cancer may also be taken out to make sure that all of the cancerous cells have been removed. Types of
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not dangerous‚ but can leave skin scars. Human skin has pores (tiny holes) which connect to oil glands located under the skin. The glands are connected to the pores via follicles - small canals. These glands produce Sebum‚ an oily liquid. The sebum carries dead skin cells through the follicles to the surface of the skin. A small hair grows through the follicle out of the skin. Pimples grow when these follicles get blocked‚ resulting in an accumulation of oil under the skin. n humans‚ pimples tend to
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Blood and Bone Marrow Transplants Dr. Fernandez Intro: “Allow me to talk a little bit about Dr. Fernandez. Currently‚ he is a member and the chief of the Department of Blood and Marrow Transplantation at the Moffitt Cancer Center in Tampa‚ Florida. Dr. Fernandez received his MD at the University of Florida medical school‚ and he completed his internship‚ residency‚ and fellowship in hematology and oncology at the Miami Medical Center‚ Jackson Memorial. After‚ he completed a fellowship in transplants
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