Feedback Mechanism

You were playing basketball in the school gym. After an hour, you got tired

and thirsty. Consequently, you ran to a store and bought a bottle of water, then

you looked for a shady and cool place to relax.

1. What was the stimulus in this situation?

2. What was the response in this situation?

Your sister asked a favor from you to buy art materials needed in doing her project in Science subject. While going to market, you smelled a barbecue being grilled and started to salivate. You realized that you haven’t eaten your lunch, so you bought barbecue before buying art materials.

1. What was the stimulus in this situation?

2. What was the response in this situation?

Why does your body need oxygen?

• to produce energy

• to expel carbon dioxide

• to supply the food with oxygen

• to fill the lungs with oxygen

The brain is the control center of the human body.

• True

• False

Messages about stimuli travel to the central nervous system along which pathway?

• Efferent

• Afferent

• Effector

• Affector

The pathway of air into the lungs is:

• 
• 
• 
• 

Transcribe the given DNA sequence below.

ATC GGT GAC TAT

• TAG CCA CTG ATA

• UUG CCU CUG AUA

• UAG CCA CUG AUA

These chemical messengers are synthesized and secreted by various ______________ glands

• nervous

• endocrine

• chemical

• circulatory

Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

There are only a few receptors scattered within the body of an organism.

• True

• False