WARM-UP RECALL TO CHAPTER 1~

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Presentation transcript:

WARM-UP RECALL TO CHAPTER 1~ Statement of Inquiry: 8/26/2015 AGENDA 5 min ~HOMEOSTASIS WARM-UP RECALL TO CHAPTER 1~ What are the two homeostatic mechanism that occur in the body? Give a physiological example of each mechanism. Include the stimulus, receptor, control center, effector for each. Objective: SWBAT investigate and explain homeostasis and the transportation of molecules, across membranes. Enter the classroom silently and find your seat. Essentials: Pen or Pencil, book, Cornell notes page. HW: Scientific Method in Action Warm - Up Wait silently for instructions

Objective: By the end of the class scholars will be able to understand the homeostatic mechanism of the human body involved with positive and negative feedback. What do you remember from chapter 1? Shout out.

Homeostasis Maintaining a healthy environment inside the body with the organs working together to control factors within normal boundaries such as: body temperature blood pressure blood sugar water balance sodium levels

Control Center Effector Stimulus Afferent pathway Change in variable Receptor Structure that detects change in variable Efferent pathway Control Center Initiates change based on input from receptor Effector Structure that causes change to stimulus Homeostasis Internal balance returned

Negative Feedback Conditions exceeding a set limit in one direction triggers a reaction in the opposite direction

Example of Negative Feedback Body temperature rises above normal temperature Body receptors detect change in temperature Hypothalamus in the brain trigger signals to different organs Human body starts sweating Evaporation of sweat on the skin cools the body Blood vessels close to the skin dilate to help release heat Write an example of a negative feedback loop if the body became too cold. Include stimulus, receptors, control center, effectors.

Positive Feedback Conditions exceeding a set limit in one direction trigger a reaction in the same direction

Homeostatic Imbalance Organ systems have a diminished ability to keep the body’s internal environment in a certain range Example: type II diabetes Insulin controls blood sugar levels and moves glucose out of bloodstream Pancreas does not make enough insulin or cells do not respond normally to insulin Could lead to kidney failure, limb amputations, blindness

Metabolism Metabolism = all chemical operations within the body Anabolism = complex proteins constructed from simpler proteins Catabolism = complex proteins broken down into simpler proteins ATP from food we eat

Areas to review for the test Body regions Relative directions Body cavities Characteristics of life Cell organelles – function Cell cycle – cancer, stem cells Homeostasis/metabolism Active & passive transport Osmosis SPELLING COUNTS!

Exit Ticket 1. All chemical operations going on within the body are collectively known as: A. Metabolism B. Homeostasis C. Syndrome D. Pathology 2. Which body systems typically initiate homeostatic responses? 3. In breast feeding, the harder and more frequent the infant suckles, the more milk is produced and secreted from the mammary glands and ducts. This phenomenon is called: A. Metabolism B. Anabolism C. Negative feedback D. Positive feedback 4. Describe what homeostasis is and how it helps to maintain health.