Question

1. what is the main function of structures e?

a. they exchange oxygen and carbon dioxide directly with the blood.
b. they carry blood cells and nutrients into the lungs.
c. they contract and relax to pump air in and out of the lungs.
d. they filter air with cilia and mucous as it passed toward the alveoli.

1. kayden is walking barefoot on the beach when he suddenly steps on a sharp sea immediately pulls his foot away to hold it. which best describes why kayden was abl

a. his sensory neurons in the pns detected pain and sent signals to the cns, which and sent commands back through motor neurons in the pns to move his foot.
b. his motor neurons in the cns detected pain and sent signals to the pns, which and sent commands back through sensory neurons in the cns to move his foot.
c. his motor neurons sensed the seashell directly, carrying the pain signal to the br to contract without any role from the sensory neurons.
d. his spinal cord absorbed the pressure from the seashell, preventing pain from tr produced a response without needing any sensory input.
the image shows a model of a body system. use it to answer questions #13 and

Explanation:

Question 10 (Kayden's reflex action)

To determine the correct answer, we analyze the reflex arc:

• Sensory neurons (in PNS) detect stimuli (sharp seashell, pain).
• They send signals to the CNS (brain/spinal cord).
• CNS processes and sends commands via motor neurons (in PNS) to muscles for response (pulling foot away).
• Option A matches this: Sensory neurons in PNS detect pain, send to CNS, CNS sends commands back via motor neurons in PNS to move foot.
• Option B is wrong: Motor neurons don’t detect pain (sensory do).
• Option C is wrong: Motor neurons don’t carry pain signals (sensory do) and reflex needs sensory input.
• Option D is wrong: Spinal cord doesn’t absorb pressure; reflex needs sensory input.

Answer:

A. His sensory neurons in the PNS detected pain and sent signals to the CNS, which and sent commands back through motor neurons in the PNS to move his foot.

Note for Question 18 and others (like #12):

Since the image/model for those questions isn’t fully visible (especially structure E and the body system model), more details (like the diagram’s labels/description) are needed to answer accurately. If you can provide the image details or text description of the model/structures, I can help solve those too.