Question

1. matter is not created or destroyed. when a person loses weight, where does the fat go?

a) it is released as co₂ and h₂o
b) it is converted into glycogen
c) it is released as o₂
d) it converts into c₆h₁₂o₆

1. when you eat a candy bar, your blood glucose level rises shortly after. your body responds by releasing insulin. this is an example of:

a) a positive feedback loop
b) a negative feedback loop
c) a failure of homeostasis
d) a hormonal imbalance

1. when your body shivers to warm up, its an attempt to maintain a constant body temperature. this is an example of:

a) a positive feedback loop
b) thermoregulation
c) glucose regulation
d) osmoregulation

1. a person with type 1 diabetes is unable to produce which hormone?

a) glucagon
b) insulin
c) thyroxine
d) cortisol

1. what is the main hormone that lowers blood glucose levels by promoting the uptake of glucose into cells from the blood stream?

a) glucagon
b) insulin
c) adrenaline
d) thyroxine

1. which molecule acts as the primary energy currency for the cell?

a) glucose
b) atp
c) carbon dioxide
d) water

Explanation:

• Question 5: Fat is metabolized through cellular respiration. The carbon and hydrogen in fat are combined with oxygen to produce carbon - dioxide ($CO_2$) and water ($H_2O$), which are exhaled and excreted.
• Question 6: When blood glucose rises, insulin is released to lower it back to normal levels. This is a negative feedback loop as it counter - acts the initial change.
• Question 7: Shivering to warm up is a form of thermoregulation, the body's attempt to maintain a stable internal temperature.
• Question 8: Type 1 diabetes is characterized by the body's inability to produce insulin due to the destruction of pancreatic beta - cells.
• Question 9: Insulin promotes the uptake of glucose from the bloodstream into cells, thus lowering blood glucose levels.
• Question 10: Adenosine triphosphate (ATP) is the primary energy currency of the cell, used to power various cellular processes.

Answer:

1. a) It is released as $CO_2$ and $H_2O$
2. b) A negative feedback loop
3. b) Thermoregulation
4. b) Insulin
5. b) Insulin
6. b) ATP