Homeostasis and Levels of Organization

An atom is...

• the small parts that have different jobs in a cell

• the smallest part of a substance that cannot be broken down chemically

• a group of cells that are similar in structure and funtion

• different types of tissues working together to perform a similar function

What is the most basic unit of LIFE?

• Atom

• Molecule

• Tissue

• Cell

Tissues are made of....

• Blood

• Cells

• Organs

• Organelles

Which term describes the systems in an organisms that maintain homeostasis?

• Receptor Organ

• Environmental Stimulus

• Feedback Loop

• Homeostasis

Which of the following is an example of positive feedback to indirectly maintain homeostasis?

• the chemical reactions involved in blood clotting after a wound

• blood vessels constrict and shivering in response to low body temperature

• blood vessels dilate and sweating in response to high body temperature

• coach compliments performance during practice

Homeostasis:

• allows for wildly fluctuating internal environment due to lack of feedback regulation

• is the maintenance of relatively stable internal environment and often incorporates a form of feedback regulation

• is the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation

• is impossible in vertebrates

Positive or Negative Feedback Loop?

When you get cut, your skin cells release hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop bleeding and form a blood clot. The hormone signals continue until the cut is closed.

• Positive Feedback Loop

• Negative Feedback Loop

Positive or Negative Feedback Loop?

You eat a donut for breakfast, and your pancreas releases insulin to lower the glucose levels in your blood

• Positive Feedback Loop

• Negative Feedback Loop

Positive or Negative Feedback Loop?

It is a beautiful 75 degree day in May. You have to run a mile during PE. Your body starts to sweat, your breathing rate increases, and your face is flushed because it is so HOT.

• Positive Feedback Loop

• Negative Feedback Loop

Correct order of organization from atom to organisms?

• Organism - organ system - organ - tissue - cell - organelle - molecule - atom

• Organism - organ system - tissue -cell - organ - organelle - molecule - atom

• Atom - tissue - organelle - cell- molecule - organ - organ system - organism

• Atom - molecule - organelle - cell- tissue - organ - organ system - organism