Introduction and FEEDBACK LOOPS

Slides:



Advertisements
Similar presentations
Section 28-2 “Homeostasis”
Advertisements

Sponge (Pg. 36) Hypothesize how these climbers hang on to their body temperature.
CHAPTER 40 AN INTRODUCTION TO ANIMAL STRUCTURE AND FUNCTION Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Section C: Regulating.
A Quick Review Modified from J.Pheifer Auburn High School.
Keystone Anchor BIO.A.4.2 Explain mechanisms that permit organisms to maintain biological balance between their internal and external environments.
Conditions within the body must remain within a narrow range.
Sponge (Pg. 36) Hypothesize how these climbers hang on to their body temperature.
KEY CONCEPT The human body has five levels of organization.
Day Objective: Define homeostasis and its affect on human body systems. Describe the role of the cell membrane in maintaining homeostasis. Warm up: Which.
Introduction to Animal Structure and Function
Weird Body Quirks Brain freeze “Ice cream headaches” happen when something cold touches nerves in the roof of the mouth, triggering blood vessels in the.
35-1 Summary. Levels of Organization Chemical Chemical Cellular Cellular Tissue Tissue Organs Organs System Level System Level Organismic Level Organismic.
Ch. 28 Notes: Human Systems and Homeostasis. Objectives  10C analyze the levels of organization in biological systems and relate the levels to each other.
Lecture #6 Ms. Day/ Honors Biology
HOMEOSTASIS Staying within limits Limits Staying Limits Keeping enzymes happy Maintainin g a balance.
KEY CONCEPT The human body has five levels of organization.
I can relate homeostasis to the internal environment of the body
Balancing Act- Mechanism of Homeostasis
28.2 & 28.3: Homeostasis Key Concept: Homeostasis is the regulation and maintenance of the internal environment. Key Concept: Body systems interact to.
SBI 4U: Metablic Processes
Introduction to Homeostasis
28.2 & 28.3: Homeostasis Key Concept: Homeostasis is the regulation and maintenance of the internal environment. Key Concept: Body systems interact to.
Maintain yourself!. What is it? HOMEOSTASIS- this means a state of equilibrium homeo--same stasis--standing still A. The maintenance of a stable internal.
(Foundation Block 4) Homeostasis I By Ahmad Ahmeda
Characteristics of Life  Organisms respond to their environment Organisms respond to their EXTERNAL environment Organisms respond to their EXTERNAL environment.
An Introduction to Anatomy and Physiology
Conditions within the body must remain within a narrow range.
Weird Body Quirks Brain freeze
Homeostasis.
Topic 9: Control Systems
28.2 & 28.3: Homeostasis Key Concept: Homeostasis is the regulation and maintenance of the internal environment. Key Concept: Body systems interact to.
INTRODUCTION TO PHYSIOLOGY
Homeostasis.
28.2 & 28.3: Homeostasis Key Concept: Homeostasis is the regulation and maintenance of the internal environment. Key Concept: Body systems interact to.
The Human Body: An Orientation
Human Body Systems and Homeostasis
I can explain mechanisms of homeostasis
HOMEOSTASIS.
Homeostasis.
HOMEOSTASIS How does the body maintain body temperature, blood calcium or glucose levels, or the right amount of water?
Conditions within the body must remain within a narrow range.
Write everything that is underlined
Conditions within the body must remain within a narrow range.
Write everything that is underlined
Aim: How does your body maintain homeostasis?
Homeostasis A Quick Review Modified from J.Pheifer Auburn High School.
Homeostasis and Feedback Loops EQ: What is homeostasis and how are feedback loops used to achieve it?
Write everything that is underlined
SBI 4U: Metablic Processes
Conditions within the body must remain within a narrow range.
Conditions within the body must remain within a narrow range.
A Major Biological Theme: Organisms must keep their cells in specific conditions in order to survive in diverse environments. Homeostasis is the maintenance.
Introduction to Physiology
KEY CONCEPT The human body has five levels of organization.
“Homeostasis”.
Interactions Among Animal Systems (Part One)
Conditions within the body must remain within a narrow range.
The student is expected to: 4B investigate and explain cellular processes, including homeostasis, energy conversions, transport of molecules, and synthesis.
Control of the Internal Environment. Objectives Define the terms homeostasis and steady state Diagram and discuss a biological control system Give an.
Introduction to Physiology
Organization of Life & Homeostasis Ms. Day/ AP Biology.
Homeostasis Biology 12.
Section 28-2 “Homeostasis”
Homeostasis.
Interactions Among Animal Systems (Part One)
What is Homeostasis? • process by which a constant internal environment is maintained despite changes in external environment • performed by the endocrine.
Introduction to Homeostasis.
Endocrine System FeedBack models
KEY CONCEPT Biology is the study of all forms of life.
Homeostasis??? DYNAMIC EQUILIBRIUM????.
Presentation transcript:

Introduction and FEEDBACK LOOPS Homeostasis Introduction and FEEDBACK LOOPS

Introduction Conditions in the body must be kept within a narrow range Homeostasis: The maintenance of a consistent internal environment despite external changes (keeping the environment between set ranges or maintaining a dynamic equilibrium)

Main Internal Dynamic Equilibriums Body Temperature Water Balance/Blood Pressure Water/Ion Balance Blood Glucose Levels Blood O2/CO2 levels (pH)

Forms of Regulation Voluntary: Control the internal environment by conscious control (think about it) Ex. Put on warm clothes in the winter, swim in the summer Involuntary: control of the internal environment without conscious thought Ex. Increased respiration when exercising

Regulation Mechanisms 1. Osmotic Pressure differential between 2 solutions on opposite sides of semi-permeable membrane Ex. Kidney & urine formation 2. Hormonal: Chemical messenger Slow communication, long term Ex. Growth hormone

Regulation Mechanisms continued 3. Nervous ▫ Fast Often works with endocrine system (hormones into bloodstream) Ex. Shivering 4. Immune Defends body against microorganisms & viruses Ex. Fever

Feedback Loops Any homeostatic control system has three functional components: a receptor, a control center, and an effector. RECEPTORS: detects a change in some variable in the animal’s internal environment, such as a change in temperature. CONTROL CENTRE (Integrator): processes the information it receives from the receptor and directs an appropriate response EFFECTOR: Molecule, signal or vessel that directs the change (restores balance)

Control systems help maintain homeostasis. 1. sensors gather data 2. control center receives data, sends messages 3. communication system delivers messages to target organs, tissues (EFFECTORS) 4. targets respond to change pore sweat glands hair follicle muscle goose bump

Negative Feedback Loops Negative feedback counteracts change as the effector will trigger responses that return conditions to the standard state In this case, the control center, called a thermostat, also contains the receptor, a thermometer. When room temperature falls, the thermostat switches on the heater, the effector.

Positive Feedback Loops Positive feedback involves a change in some variable that trigger mechanisms that amplify rather than reverse the change. For example, during childbirth, the pressure of the baby’s head against sensors near the opening of the uterus stimulates uterine contractions. These cause greater pressure against the uterine opening, heightening the contractions, which cause still greater pressure. Positive feedback brings childbirth to completion, a very different sort of process from maintaining a steady state.

Positive feedback increases change.

Do we always maintain? Most systems try to maintain a standard range although some regulated change is allowed Cyclic change: ex. Menstruation cycle in women Reaction to Challenge: ex. Fever if sick

How is Homeostasis Disrupted Homeostasis can be disrupted for several reasons. sensors fail targets do not receive messages injury illness Prolonged disruption can cause injury or severe problems therefore a considerable amount of the energy gained from food is used to maintain an organisms internal environment.