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Stimulus: Rising or Declining Blood Pressure
Receptor: baroreceptors that can detect arterial blood pressure
Effector: baroreceptor receptors that detect if blood pressure is too high or too low send a signal to the hypothalamus.
The hypothalamus then sends a message to the heart, blood vessels, and kidneys.
The Hypothalamus acts as a effector in blood pressure regulation.
Response: trigger a sympathetic response
This stimulates a change in blood pressure to reach balanced levels.

Diseases: heart disease, heart attack, and stroke.

Abdullah Erradi

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Osmoregulation via ADH is a negative stimulus because it returns the decreased water levels back to homeostasis.

Stimulus: Decreased water levels.

Receptor: hypothalamic osmoreceptor.

Osmoregulation via ADH controls the amount of urine that is formed within the body to maintain a certain level of water.

Response: ADH is released which promotes more water to be reabsorbed within the body.

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Ethylene exposure increases breakdown of chlorophyll (causing yellowing), reduces storage life, increases sensitivity to chilling injury and can help spread decay.

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Stimulus: Rising blood pressure

Receptor: Baroreceptors are the receptors that are located in the carotid sinus that help to regulate blood pressure

Effector: Decreased heart rate and increase blood vessel diameter

Response: Blood pressure returns to normal

Mohammed Abdulla

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Lina Sulieman: Stimulus: Breakage/tear in vessel wall

more_vertical

The process of blood coagulation (hemostasis) is a cascading positive feedback loop. When the body is damaged inside or outside, the damaged tissues release factors that cause platelets to adhere to the tissue (the effector) at the site of the wound. The platelets release granules that activate and attract more platelets and cause them to bind to each other.

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Negative Feed Back

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Stimulus: High blood sugar

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Stimulus: water level dropping or increasing
Receptor: pituitary gland releasing ADH
Effector: Kidney and hypothalamus
Response: reduction or increasing water level

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The positive feedback mechanism of fruit ripening 

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Fruit Ripening (Sheikhah, Yousif Eladawy, Hind, Maryam) 

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Fruit Ripening (Sheikhah, Yousif Eladawy, Hind, Maryam) 

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Stimulus: ripening of the apple
Receptor: SIETR7 Ethylene receptor
Effector: Other apples
Response: The other apples will ripen and the cycle continues as the apples produce more ethylene

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(Abdalrahman Muftah, Malek Al-Serhi, Lina S and Mohamed)