Week 1 CBIO 2200 class notes
Week 1 CBIO 2200 class notes CBIO 2200
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This 5 page Class Notes was uploaded by Bailey Dickinson on Wednesday August 10, 2016. The Class Notes belongs to CBIO 2200 at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months taught by in Fall 2016. Since its upload, it has received 132 views. For similar materials see Anatomy and Physiology I in Cellular biology at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months.
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Date Created: 08/10/16
Notes for CBIO 2200 CRN17428 CH1 Introduction to the Human Body (8/11/2016) **We have a quiz over the syllabus next class (8/16) **A chemistry worksheet will be posted on ELC and will be due in-class for a quiz grade **Suggestion to purchase an anatomy coloring book **There will most likely be an online lab manual provided to us 1. Why study Anatomy and Physiology? - We must understand normal structure and function so you’re able to identify abnormal or incorrect function -We must understand mechanisms of therapies used to treat dysfunction -Identify targets for new therapies -If you understand what is wrong with the patient, you can compose a mechanism to treat them We are trying to understand “How does the human body work?” 2. Pathophysiology vs. Physiology 3. Levels of organization of the human body: a) Chemical b) Cellular c) Tissue d) Organ e) System Necessary life functions of humans: -Maintain boundaries -Movement (both walking and the movement f substances in the internal environment) -Respond to stimuli in the environment -Metabolism/Digestion -Excretion -Reproduction -Differentiation -Growth 4. HOMEOSTASIS a) The “overall job” of every system in the body b) Balance! “Condition of equilibrium (balance) in the body’s internal environment..” Interplay of many, many processes Maintain certain, particular internal conditions -Body temperature -Blood glucose -Internal chemical reactions operate at specific pHs (certain enzymes work best in certain pHs. Proteins can become denatured at the wrong temperatures) Why did we watch a video about Helen Keller? Helen Keller had scarlet fever and was sick for more than a week, losing her sight and hearing. Because the temp was disrupted and she therefore lost sight and hearing, it’s interesting to see the correlation. 5. Feedback and feedback systems a) Maintain homeostasis In a negative feedback loop, a stimulus- a deviation from a set point- is resisted through a physiological process that returns the body to homeostasis -A negative feedback loop has four basic parts -Body temperature is regulated by negative feedback stimulus, receptor, control center, and effector (four parts) The effector brings about a change that restores the homeostasis The response “feeds back” to affect the stimulus (hence, “feedback”) BODY TEMPERATURE IS REGULATED BY NEGATIVE FEEDBACK Temperature Rises (stimulus) Receptor (thermostat) Control Center also thermostat Effector (AC unit) Response (Temperature falls) Negative feedback because the temperature is increasing, but the response is a decrease in temperature. The stimulus and response are in opposite directions. The response negates the effect of the stimulus. A positive feedback loop is when the stimulus is reinforced by the response- less common in physiology because then net result is that the response pushes you further away from that set point. NEGATIVE FEEDBACK tends to negate the effect of the stimulus POSITIVE FEEDBACK tends to reinforce the effect of the stimulus Classic example of positive feedback loop is childbirth: A positive feedback loop results in a change in the body’s status -The receptors would be the stretch receptors in the cervix -The control center is the posterior pituitary of the brain -The effectors are the uterine wall muscles
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