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List the fundamental properties shared by all cells. Describe the importance of each of these properties.

what is product of light reaction in photosynthesis

  1. Based on Rosa’s symptoms, which parts of her brain may have been affected by Alzheimer’s disease? 
  2. How are messages sent between cells in the nervous system? What molecules are involved in this process? In what ways can drugs alter this process? 
  3. Why can’t Rosa’s brain simply grow new cells to replace the ones that have died? 
  4. How do certain classes of drugs help with neurotransmission in the brain? Could this help Rosa? 

How do motility and secretions of the stomach contribute to the digestive process?


If DNA of a particular species was analyzed and it was found that it contains 27 percent A, what would be the percentage of C?


Explain the effect of the parasympathetic division of the autonomic nervous system on cardiac output


How can Roger avoid running into a person if he is blind


1.What is the stimulus in the feedback loop below?

2.What is the control center in the feedback loop below?

3.Mention 2 effector organs that process so that the body could return to a set point?

When body temperature drops, the hypothalamus initiates several physiological responses to increase heat production and conserve heat: Narrowing of surface blood vessels (vasoconstriction) decreases the flow of heat to the skin; shivering commences, increasing production of heat by the muscles; Adrenal glands secrete stimulatory hormones such as norepinephrine and epinephrine to increase metabolic rates and hence heat production. These effects cause body temperature to increase. When it returns to normal, the hypothalamus is no longer stimulated, and these effects cease.

(feedback mechanism)

(feedback mechanism)

1.) What organ is the probable control center in the feedback loop below?

2.) What is the stimulus in the feedback loop below?

3.) Enumerate the 2 effector organs that process so that the body could return to a set point?

When the high blood glucose level is detected, the beta cells in the pancreas are stimulated to increase the production of insulin. These hormones are released into the bloodstream which will allow body cells to take up more glucose. Liver will be stimulated to take up glucose and store it as glycogen. These responses will allow blood glucose to decline to a set point thereby diminishing the stimulus to release insulin.

What is the stimulus in the feedback loop?

When the high blood glucose level is detected, the beta cells in the pancreas are stimulated to increase the production of insulin. These hormones are released into the bloodstream which will allow body cells to take up more glucose. Liver will be stimulated to take up glucose and store it as glycogen. These responses will allow blood glucose to decline to a set point thereby diminishing the stimulus to release insulin.

(lesson: feedback mechanism)

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