Note To determine the type of mechanism you must be able to determine the stimulus and response Feedback Mechanisms Identify a Stimulus and Response Your dog chases the ball and you say Good Boy ID: 704259
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Slide1
Feedback mechanisms
Are used to either maintain or amplify (to increase) chemical systems in the body.
Note: To determine the type of mechanism you must be able to determine the stimulus and response.Slide2
Feedback MechanismsSlide3
Identify a Stimulus and Response
Your dog chases the ball and you say “Good Boy!”
Stimulus: __________________
Response:__________________
Your dog pees on the rug and you say “Bad Dog!”
Stimulus:____________________
Response:____________________Slide4
Feedback Mechanisms
Positive Feedback
Negative Feedback
The response will increase the stimulus
Does not return to homeostasis but will cause more of the stimulus to happen.
The response will decrease the stimulus or return the system back to homeostasis.Slide5
Feedback Mechanisms
?
?
The dog pees on the rug and you say “Bad Dog!”
Is this Positive or Negative Feedback?
The dog chases the ball and you say “Good Boy!”
Is this positive or Negative Feedback?Slide6
You have your head phones in listening to your favorite songs.
Positive Feedback
Negative Feedback
What would be an example?
What would be an example?Slide7
The Circulatory SystemSlide8
Functions
To transport oxygen to the cells of the body so cells can continue Cell Respiration
To Transport nutrients to the cells of the bodySlide9
Parts
Heart
Blood Vessels
BloodSlide10
Components of Blood
Red blood cells
White blood cells
Platelets
PlasmaSlide11
What are Red Blood Cells?
Also called erythrocytes
Transport oxygen
Contain Hemoglobin
An iron containing protein that binds to oxygen
Gives blood a red colorSlide12
What are White Blood Cells?
Also called leukocytes
Can live for days, months or even years
Guard against infection, fight parasites, and attack bacteria
Can leave the circulatory system and go into the immune system fighting infectionSlide13
What are two kinds of White Blood Cells?
Phagocytes (eating cells)
Engulf and digest bacteria and other disease causing bacteria
Lymphocytes
Produce antibodies that are proteins to help destroy pathogensSlide14
What are platelets?
Cell fragments needed for clotting
Clotting process
Platelet comes in contact with edges of broken blood vessel and becomes sticky
A cluster of platelets gathers around the wound forming a clot (scab) Slide15
What is plasma?
Fluid part of blood (mostly made of water)
Straw colored
Transport fatty acids, hormones and vitamins
Regulate osmotic pressure and blood volume
Fight viral and bacterial infections
Aid in blood clottingSlide16
What are blood vessels?
Types of blood vessels
Arteries (largest)
Capillaries (smallest)
VeinsSlide17
What are arteries?
Large, thick walled blood vessels
Carry blood from the heart to the cells
All arteries except the pulmonary artery carry oxygen rich bloodSlide18
What are capillaries?
Tiny blood vessels with walls that are only one cell thick
Oxygen and nutrient absorption take place in the capillaries
Also carbon dioxide and waste products move into the blood through the capillaries
Diffusion
of Oxygen and Carbon Dioxide occurs here in the lungs.Slide19
What are veins?
Smaller than arteries but larger than capillaries
Return blood to the heart
Contain valves to keep blood flowing towards the heartSlide20
Parts of the Heart
Superior Vena Cava
Right Atrium
Right Ventricle
Inferior Vena Cava
Septum
Left Ventricle
Left Atrium
Pulmonary Artery
Pulmonary Vein
AortaSlide21
Blood Flow Through the Heart
Oxygen poor-
1.) Superior and inferior vena cava
2.) Right Atrium
3.) Right Ventricle
4.) Lungs
Oxygen rich-
5.) Left Atrium
6.) Left Ventricle
7.) Aorta
8.) BodySlide22
Blood Flow Through the Body
Pulmonary circulation
Right side of the heart pumps blood from the heart to the lungs
Systemic circulation
Left side of the heart receives blood from the lungs and pumps it to the rest of the bodySlide23
Feedback Mechanisms in the Circulatory Syste
m
When human tissue, such as
skin is torn or cut
, all the cells near the damage send out a signal that activates the platelets in that area.
A the platelets begin to form a plug,
they send out chemical signals calling for more platelets i
n order to stop the bleeding.
Stimulus:__________
Response:_________
Feedback:_________Slide24
Feedback Mechanisms in the Circulatory System
When muscle cells are active they need more ENERGY (ATP). In cellular respiration, the Mitochondria uses Oxygen to make ATP. After you are
done exercising
, your
breathing returns to a normal rate because the amount of Oxygen required by your cells has decreased.
Stimulus: ______________
Response:______________
Feedback:_______________