Introduction & Review. Dr. Ali Ebneshahidi. Copyright 2004 Pearson Education, Inc., publishing as Benjamin Cummings
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1 Introduction & Review Dr. Ali Ebneshahidi
2 Physiology A. Anatomy and physiology Anatomy = study of structure (morphology) of body parts ; their forms, arrangements and relationships. physiology = study of the functions of body parts ; what they do and how they do it. Anatomy and physiology are inseparable, this is called the complementarily of structure and function. " form fits function " (FFF) is a central theme in biology what a structure does is defined by its shape and location.
3 Five factors needed to maintain life water, food, oxygen, heat, and pressure water -- an important medium for metabolic or chemical reactions where molecules interact with one another. Food -- an important source of energy production, a process mainly Occurred in the mitochondria of cells. Oxygen --a chemical substance involved in energy release in the cells. Heat-- a form of energy that helps in regulating the rate of metabolism. Pressure another form of energy that helps in regulating certain Physiological processes, such as breathing mechanisms regulated by atmospheric and alveolar pressure, and circulation regulated by hydrostatic and osmotic pressure.
4 Homeostasis a dynamic equilibrium of the internal environment where the nervous and endocrine systems are the most important to maintain it.
5 4. All organ systems, except the reproductive system, are designed to achieve these factors.
6 vital signs = indicators of homeostatic regulations that are commonly detected and observed by medical workers. They include body temperature, blood pressure, pulse rate, respiratory function and brain activity. Negative feedback mechanism = regulates homeostasis by turning off or reducing the original stimulus (e.g. body temp, heart rate, breathing rate and depth, blood levels of glucose ). It consists of a stimulus, a receptor, a regulator, a response, and normalcy, arranged in a loop. Positive feedback mechanism = rarely is used by the body to achieve homeostasis since it can lead to diseases if not carefully controlled. It intensifies the initial stimulus, leading to an enhancement of response (e.g. proteins and calcium involved in blood clotting, hormones involved in ovulation and labor contraction.
7 Negative Feedback Figure 1.5
8 Positive Feedback In positive feedback systems, the output enhances or exaggerates the original stimulus Example: Regulation of blood clotting Figure 1.6
9 D. Levels of organization Particles atom molecule macromolecule organelle cell tissue organ organ system organism. Example : neutrons, protons, electrons carbon, hydrogen, oxygen Glucose carbohydrate cell membrane cuboidal cell epithelial tissue intestine digestive system human body. The particles (or subatomic particles) are the smallest units known in creating matters. The cells are the smallest living units, capable of surviving on their own.
10 Levels of Structural Organization 2 Smooth muscle cell Cellular level Cells are made up of molecules Molecules Atoms 3 Tissue level Tissues consist of similar types of cells Smooth muscle tissue Cardiovascular system 1 Heart Chemical level Atoms combine to form molecules Blood vessels Connective tissue Epithelial tissue Smooth muscle tissue Blood vessel (organ) 6 Organismal level The human organism is made up of many organ systems 4 Organ level Organs are made up of different types of tissues 5 Organ system level Organ systems consist of different organs that work together closely Figure 1.1
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