Feedback Loop & the Endocrine System

Feedback Loop & the Endocrine System

By Mr. Cavida

​Objectives:

​a. Define what is a feedback loop

b. Differentiate a negative feedback loop from a positive feedback loop.

c. ​Describe the function of the endocrine system

Multiple Choice

What is the point of a feedback loop?

• To provide the body with more energy

• To provide the body with more food

• To make sure the conditions in the body are always changing

• To make sure the conditions in the body remain stable

Multiple Choice

A feedback loop best fits which characteristic of life?

• Cells

• Organization

• Homeostasis

• Adaptation

Multiple Choice

In this body temperature feedback loop, predict what would happen if cooling mechanisms were NOT activated?

• The body would not warm up.

• The body would not cool down.

• Your body would get colder and colder.

• Your body would release lots of heat.

Multiple Choice

Failure to maintain homeostasis could result in:

• lack of internal balance
• eventual death
• difficulty carrying on metabolism 
• all three

Multiple Choice

The two types of feedback systems that help organisms maintain homeostasis are:

• positive and negative 
• receptor and effector
• static and dynamic
• minor and major

Multiple Choice

Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

Multiple Choice

The process of childbirth is an example of:

• negative feedback loop
• positive feedback loop

Multiple Choice

The "cause" for something to happen is the

• response
• effect
• stimulus
• homeostasis

Multiple Choice

The "effect" of a given stimulus is the...

• response
• stimulus
• cause
• result

Multiple Choice

The name for a chemical made by glands that tell cells to make something or respond in some way.

• acid
• enzyme
• perspiration
• hormone

Multiple Choice

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. The hormone signals continue until the cut is closed.

• Positive Feedback Response
• Negative Feedback Loop 

Multiple Choice

Rapid growth during puberty causes your body to release more and more growth hormones. As you grow, more and more growth hormones are released until puberty is reached, and then the hormones stop.

• Positive Feedback Response
• Negative Feedback Loop 

Multiple Choice

Negative Feedback Loops:

• amplify processes
• prevent small changes from getting larger
• are initiated during childbirth
• are found only in plants

Multiple Choice

What does the term "steady state" refer to with respect to the process of homeostasis?

• balanced external environment
• balanced internal environment
• changing external environment
• changing internal environment

Multiple Choice

What is the pituitary gland?

• the master gland
• helps you go to sleep
• influence metabolic rate
• decrease blood calcium

Multiple Choice

Function of pituitary gland:

• produces the highest number of different hormones
• senses the hormone levels in the blood
• increase bone calcium levels
• decrease blood calcium

Multiple Choice

What is the function of hypothalamus?

• the master gland
• controls all other endocrine glands
• senses the hormone levels in the blood
• helps you go to sleep

Multiple Choice

Endocrine glands secrete _

• Hormones

• Neurotransmitters

• A wide range of chemical substances

Multiple Choice

What is the main function of the endocrine system?

• It creates chemicals, or hormones, that are sent around the body to maintain homeostasis.

• It creates electrical messages that are sent around the body to maintain homeostasis.

• It maintains the correct level of oxygen in the body to maintain homeostasis.

• It releases waste from the body to maintain homeostasis.

Multiple Choice

An organ that produces secretions called hormones is known as a :

• chemical
• gland
• hormone
• duct

Multiple Choice

This gland is located between the lungs behind the sternum and secretes thymosin that helps mature WBC's in our bodies when we are children. 

• thyroid
• parathyroid
• thymus
• brain stem

Multiple Choice

What is gland #3?

• Adrenal Gland
• Pancreas
• Ovaries
• Testes

Multiple Choice

targets the brain and make people sleepy when its dark

• melanin
• melanoma
• melatonin
• melons

Poll

I am confident that I will pass the BA3 next week!

• Surely!

• Not sure.

• Definitely I will fail!!!