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.
A person becomes too warm during light exercise. Which coordinated response tends to restore normal core temperature? A. Less sweating, narrower skin arterioles and greater brown-fat heat production B. More sweating, narrower skin arterioles and greater…
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…
(i) Outline one physiological response that could lower the runner’s body temperature. (ii) Identify the type of feedback involved and give a reason.
During prolonged exercise on a warm day, blood flow through skin vessels increases. What is the main benefit? A. The skin removes all lactate directly into sweat B. More heat transfers from the body core to the surroundings C. Digestion is accelerated in skin…
Cold exposure increases activity in adult brown adipose tissue. How does this tissue generate heat? A. It converts every fat cell into an insulating keratin layer B. It oxidizes stored fuel while uncoupling much of respiration from ATP synthesis C. It…
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:…
(a) Outline how evaporation of sweat cools the body. (b) Describe the kidney’s response when body water is depleted. (c) Explain the movement of water from soil, through a flowering plant and into the air.
(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.
Water has physiological roles in both plants and mammals. (a) Outline how water’s properties allow evaporation to cool an animal. (b) Describe how weather affects the movement and loss of water in a terrestrial plant. (c) Explain how a dehydrated mammal…
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