Bell Ringer What things in the human body need to be regulated? Name three.

Homeostasis A deeper look into what conditions need to be maintained in the human body

What needs To be maintained?! As a class we are going to look through a series of pictures and come up with the key aspects of Homeostasis! You will need to take notes! Separate sheet of paper! What is the body regulating?! Are we getting MORE of something? Or Less of Something?? Key Terms?

Video: http://www.youtube.com/watch?v=NkzsfhqdQ0I http://www.youtube.com/watch?v=gTKpKBzd7jg

With a partner Answer: 1. What were they regulating? 2. Was there more of something?? Was there less of something?? 3. Important words you think go with this?

Temperature Humans Heat in the body is produced by: Need to maintain a almost constant body temperature Heat in the body is produced by: Muscle contractions Shivering, goose bumps

Feedback Loops The body’s way of correcting things that are off in the body. Positive Increase output Negative Decrease output

Food Gives you? ______ Homeostasis in?

Energy Energy in the body is measured in calories Measured by three things Internal heat produced Just learned this External work Movement, exercise, anything out of the body Storage Humans store calories Needed in times of little to no food

Blood Composition Many things are regulated in the blood!

Acid-Base Kidneys maintain the proper pH of the blood. pH is the scale used to describe how acidic or basic a substance is Acids are used to help break down things in the body during digestion

Sleep Your body needs to sleep Circadian Rhythms “rhythm around a day” Help repair injured cells Growth time Circadian Rhythms “rhythm around a day” Rhythm the body follows to help regulate all the requirements of one day.

Positive Feedback Loops Designed to help increase levels of things in the body. Can push things out of the normal level Example: Blood clotting in response to tear in blood vessel.

Negative Feedback Loops Designed to reduce level of things in the body Example: Blood pressure: vessels increase in size, which lowers blood pressure. Food: lower metabolism Temperature: sweating or shivering

TO DO WORK Draw out a picture representation of a feedback loop. Come up with an example based on what is regulated in the human body. Write down the scenario Is it Positive or Negative feedback? What is increasing or decreasing? Explain what is happening. Draw the feedback!