Connective Epithelial‚ and muscular tissues. From Tissues to organs Cells combine to form tissues and tissues combine to form organs. Cells combine to form four primary tissues: - Epithelial tissue - Connective tissue - Muscle tissue - Nerve tissue BACKGROUND:A tissue is a group of cells that have a similar shape and function. Different types of tissues can be found in different organs. In humans‚ there are four basic types of tissue: epithelial‚ connective‚ muscular‚ and nervous
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the dopamine‚ acetylcholine‚ gaba and glutamate. Plus‚ I will analyze their function‚ and evaluate their impact on physical and mental behavior. Neurotransmitters are stored in minute sac called vesicles located at the end of axons. When an impulse‚ reaches the
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the myelin sheath. A many-layered white‚ lipid and protein covering produced by the neuroglia that is called the myelin sheath surround the axons of most neurons. The sheath electrically insulates the axon of a neuron and increases the speed of nerve impulse conduction. Axons with such a covering are said to be myelinated whereas those without it are said to be unmyelinated. Two types of neuroglia produce myelin sheaths: neurolemmocytes and oligodendrocytes. In the PNS‚ neurolemmocytes form myelin
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There are many ways in which substances can move across the cell membrane and in which then helps in the function of the body (cells‚ tissues and organs) overall. There are 3 processes that a substance can move across the membrane‚ theses are diffusion (simple and facilitated)‚ osmosis and active transport. Both diffusion and osmosis are passive processes‚ which mean they do not need energy to occur‚ whereas active transport does require energy. All three processes are involved in many functions
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Chapter 1 • Anatomy & Physiology • Gross anatomy – visible to naked eye • Microscopic • Developmental • Pathological anatomy • Radiographic anatomy • Molecular biology • Physiology • Focuses on cellular or molecular level • Principle of Complementarity of Structure and Function • A&P are inseparable • Function reflects structure • Specific form • Levels of organization 1. Chemical level 2
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difference in skin and blood temperature from the ‘set point’ e.g. 36.7 °C‚ will be recognised as an error. The anterior hypothalamus recognises this and has a heat loss centre that sends messages to the effectors which are nerve impulses and hormonal messages. These impulses and messages are released to the required area to signal
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temperature & vibration) – Temporal lobes (memory & language functions) – Occipital lobes (vision) Cerebral Cortex Cerebral Cortex Cerebral Medulla • Composed of myelinated axons (white matter) of the neurons. • The axons conduct nerve impulses to and from different areas of the nervous system. • There are a group of cell bodies (gray matter) in the medulla known as basal ganglia or extrapyramidal system. – Basal ganglia involved in the regulation of motor activity – Degeneration
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cells‚ are specialized to capture specific forms of energy- whether heat‚ light‚ chemical‚ or mechanical (1). The environmental cues that are detected by our receptors on the surface of our body are then transformed into electrical signals‚ or nerve impulses‚ that can be sent to the brain for processing. This ensures communication between the environment and our internal system‚ specifically‚ our brain. For instance‚ if we touch a very hot surface‚ the receptors on that area of our body recognize
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“The structures of body systems are determined by their functions”. Discuss this statement‚ focussing on the Circulatory System. You should include diagrams and relevant examples in your essay. In order to survive it is necessary for every cell in the body to exchange materials as not all cells are in contact with the external environment; we rely on the circulatory system to do this which is composed of the heart‚ blood vessels and blood. The heart consists of four chambers two atria and two ventricles
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usually not the brightest things‚ and chalked it up to hormones. Now‚ however‚ there is proof that the immature acts of teenagers have a physiological cause behind them. The nerve endings in their brains are not protected adequately yet to prevent them from acting on every little impulse without regard for the consequences. The nerve endings have a covering‚ called myelin‚ which develop over time and teenagers just have not had enough time to be protected from themselves. This developmental process
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