Zadanie 4a
Outline functions of thyroxin in humans.
Homeostasis
Umiejętności w tym dziale
Umiejętności z tego działu sprawdza 29 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 27 z 57 arkuszy w bazie.
Zadania z tego działu: 29 Otwórz w wyszukiwarce z filtrami
Zadanie 21
Which pairing correctly describes the effects of insulin and glucagon? A. Insulin lowers blood glucose; glucagon promotes glucose release from the liver B. Insulin raises blood glucose; glucagon prevents all hepatic glucose release C. Both hormones always…
Zadanie 21
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…
- Materiał graficzny
Zadanie 21
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
Zadanie 21
After dinner the glucose concentration falls from its peak towards baseline. Which response could produce this decrease? A. Glucagon stimulates conversion of glycogen to glucose B. Insulin promotes uptake of glucose and its storage as glycogen C. Insulin…
- Materiał graficzny
Zadanie 22
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
Zadanie 6
Feedback regulates physiological variables. (a) Discuss positive and negative feedback in variable control. (b) Describe the regulation of human blood glucose. (c) Explain responses expected when blood pH falls below its usual range. One additional mark is…
Zadanie 20
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…
Zadanie 21
The graph models exercise interrupted by rest at minutes30–50 and80–100. Which response can contribute to the temperature falls during rest? A. Contraction of skeletal muscles in shivering B. Increased blood flow through vessels near the skin surface C.…
- Materiał graficzny
Zadanie 8
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…