Explain vascular changes, sweating, shivering, brown-fat activity and other responses to temperature deviations.
Tę umiejętność sprawdza 10 zadań wzorowanych na arkuszach IB z lat 2022–2026.
The diagram shows a change in skin arterioles following a change in environmental temperature. Which response is likely to accompany it? A. More sweat secreted to the skin surface B. Increased shivering activity in skeletal muscles C. Body hairs lying flatter…
A warm environment raises a person’s core temperature. Which response helps increase heat loss? A. More shivering contractions B. Constriction of skin arterioles C. Dilation of skin arterioles D. Increased uncoupled heat production
A healthy person’s core temperature falls below its regulated range. Which response increases heat production? A. Increased sweating B. Increased shivering C. Widening of skin arterioles D. Reduced skeletal-muscle activity
Cold exposure increases activity in adult brown adipose tissue. How does this tissue generate heat? A. It stops respiration to trap oxygen B. It converts every fat cell into an insulating keratin layer C. It oxidizes stored fuel while uncoupling much of…
Animals must function under changing environmental temperatures. (a) Explain mechanisms of human thermoregulation. (b) Explain how temperature affects enzyme activity. (c) Distinguish the thermal properties of air and water in relation to animal habitats. One…
After body temperature rises above the regulated range, which response and feedback classification are appropriate? A. Negative feedback: increased skin blood flow promotes heat loss B. Positive feedback: shivering reduces heat production C. Negative feedback:…
(i) With reference to the model, explain evaporation of water from sweat. (ii) Outline why humans secrete sweat when body temperature rises.
Using the data, explain why ethane would be less suitable than water for evaporative cooling at the skin.
(a) Explain how temperature influences enzyme activity. (b) Outline how the thyroid gland contributes to regulation of human body temperature. (c) Describe how human activities contribute to a rise in mean surface air temperature.
(i) Describe the posture trend as ambient temperature rises. (ii) Suggest reasons for this trend.
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