How the Body Stays in Balance

Question 1

Which of the following best defines homeostasis and explains why it is important for an organism's survival?

Accepted Answer

Homeostasis is the body's way of keeping internal conditions like temperature and blood sugar within a narrow range, which allows cells to work properly and keeps the organism alive.

Answer

Homeostasis is the process of the body storing extra energy for later use, which helps the organism survive during food shortages.

Answer

Homeostasis means the body reacts quickly to external changes by sending nerve impulses, which keeps the organism safe from danger.

Answer

Homeostasis is the body's method of producing hormones only when needed, which prevents waste of resources.

Question 2

Which of the following best defines homeostasis and correctly explains why it is essential for a living organism to survive?

Accepted Answer

Homeostasis is the body's ability to keep internal conditions (like temperature and blood sugar) relatively constant; this stability lets cells function properly and prevents damage that could threaten survival.

Answer

Homeostasis is the rapid change of internal conditions to match the external environment; this helps the organism adapt quickly and ensures survival.

Answer

Homeostasis is the process by which the nervous system sends fast electrical signals; it is essential because it lets the brain control all body functions instantly.

Answer

Homeostasis is the secretion of hormones only during stressful situations; it is vital because hormones protect the body from illness.

Question 3

During intense exercise, a person's core body temperature rises to 38.5 °C. Which of the following sequences best describes the negative feedback response that helps return the temperature toward the normal set point of 37 °C?

Accepted Answer

Thermoreceptors in the skin detect the rise → hypothalamus signals sweat glands → sweat evaporates, removing heat → core temperature decreases toward 37 °C.

Answer

Thermoreceptors in the skin detect the rise → hypothalamus signals increased breathing rate → more CO₂ is expelled → body temperature drops slightly.

Answer

Thermoreceptors in the skin detect the rise → hypothalamus signals blood vessels to constrict → reduced blood flow to skin → heat is retained, keeping temperature high.

Answer

Thermoreceptors in the skin detect the rise → hypothalamus signals shivering → muscles generate heat → core temperature rises further.

Try three questions

Which of the following best defines homeostasis and explains why it is important for an organism's survival?

Which of the following best defines homeostasis and correctly explains why it is essential for a living organism to survive?

During intense exercise, a person's core body temperature rises to 38.5 °C. Which of the following sequences best describes the negative feedback response that helps return the temperature toward the normal set point of 37 °C?

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