ANS 2140 Body Organization and Homeostasis

What is an organ system?

being composed of 2 or more organs that work together to perform complex functions

What is an organ?

Being composed of two or more tissue types that work together to perform specific functions

What is tissue

A group of cells that are similar in structure and preform a common/related function

What are the types of tissue?

Muscle, Nervous, Epithelia, Connective

What does muscle tissue do?

Assist with movement and contraction

What do nervous tissues do?

Made up of neurons that send electrical signals throughout the body

What does connective tissue do?

Helps bind, partition, protect and support the cell matrix

Where can connective tissues be found?

Under the epithelium, adipose, tendon, bone, and blood

What are the 3 types epithelial tissue and what do they do?

Simple Squamous (lung)

• Flat and thing layer of cells so air passes through fast

Simple Cuboidal (kidney)

• Helps with absorption of nutrients and water

Simple Columnar (intestine)

• forms membranes, barriers and glands

• Is polarized meaning each end can do something different

• can be simple or stratified

What is simple tissue

Tissue made up of one layer of cells

What is stratified tissue?

Tissue made up of multiple layers of cells

What does the golgi apparatus do?

Provides different vessels that move proteins to make them functional

What do lysosomes do?

They degrade things that are not meant to be in the cell

What does the rough er do?

Translates mRNA to protein

What does the mitochondrion do?

Produce ATP

What do protein channels do?

They allow proteins to move through the plasma membrane

Define homeostasis

A state of relative consistency of the internal environment

What is a negative feed back loop? What are the steps?

A way for the body to return to normal. Starts from an imbalance at the set point then a receptor sense the change which alerts a control center which then responds with an effector until we return back to our normal or set point.

What is a positive feedback loop? What are the steps

A way for the body to amplify a signal in response to change. We start with a receptor sensing change which sends a signal to the control center which then sends out an effector which leads to amplification of that effector.

What is a key word that shows something is a positive feed back loop?

Words like “until”