Trace pancreatic hormone secretion, blood transport and target-cell responses that regulate blood glucose.
Tę umiejętność sprawdza 11 zadań wzorowanych na arkuszach IB z lat 2022–2026.
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…
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…
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…
(a) Describe how proteins are built from their constituent units. (b) Explain hormonal regulation of human blood glucose concentration. (c) Explain how meiosis contributes to genetic variation.
Which pancreatic response helps correct a fall in blood glucose? A. Conversion of its digestive enzymes into glucose receptors B. Greater glucagon secretion C. Greater thyroxine secretion D. Insulin secretion specifically to raise blood glucose
The liver stores several nutrients. State one stored nutrient other than iron.
In a model investigation, compound Q reduces liver-cell responses to glucagon. The results in diabetic animals are shown. What is a supported explanation for the treatment effect? A. The compound must directly stimulate pancreatic insulin release B. The…
Which hormone and source are correctly paired with blood-glucose regulation? A. Insulin from the thyroid gland B. Glucagon from pancreatic alpha cells C. Melatonin from liver cells D. Thyroxin from pancreatic beta cells
(a) Outline how plants use atmospheric carbon to make triglyceride oils. (b) Explain why glucose dissolves readily in water whereas triglyceride oils do not. (c) Explain how glucose availability in human tissues is regulated.
After a carbohydrate-containing meal, which response in skeletal muscle is promoted by insulin? A. Reduced uptake of glucose from the blood B. Replacement of glucose transporters by haemoglobin C. Increased uptake of glucose from the blood D. Destruction of…
State one protein or peptide that functions as a hormone.
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