MAKE CONNECTIONS: Samantha tells her doctor that she has been feeling jittery and has had trouble falling asleep. She complains that her roommates always set the thermostat too high. Blood tests reveal antibodies that suggest an autoimmune disease. Explain Samantha's symptoms. What organ are the antibodies binding to and how does this cause her symptoms?

Correct Answer: B

Rationale: Text links Samantha's symptoms (jittery, insomnia, warmth) to hyperthyroidism from Graves' disease, where antibodies bind thyroid TSH receptors ; not adrenal , pancreas , or pituitary .

Correct Answer: A

Rationale: Body fat percentage is commonly estimated using formulas that incorporate BMI and age, not just height/weight or metabolic rate.

Correct Answer: B

Rationale: The cell is the basic structural and functional unit of life in all living organisms, including humans.

Correct Answer: C

Rationale: Melanin, produced by melanocytes and present in keratinocytes, absorbs UV radiation to protect skin from sunlight damage.

Correct Answer: A

Rationale: The epiphyses are the ends of a long bone, while the diaphysis is the shaft, and other terms refer to different regions.