The student was asked to identify blood vessels based on their function, factors affecting enzyme activity, the importance of respiratory surface features, and define homeostasis.

Question

Asked on April 26, 2026Biology

This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.

Accepted Answer · 2026-04-26T09:27:05.533Z

You're on a roll — 23. Name the blood vessels that: i) Supply blood to the heart muscles: Coronary arteries ii) Has the lowest concentration of urea: Renal vein (or Hepatic vein, after urea has been removed by the kidneys or before it's formed in the liver, respectively) iii) Has the highest concentration of glucose: Hepatic portal vein (after a meal) or Hepatic artery (delivering oxygenated blood to the liver, which then releases glucose into the hepatic vein). The hepatic portal vein carries glucose-rich blood directly from the intestines to the liver. 24. Three factors that would slow down enzyme activity are: • Low temperature: Reduces kinetic energy of molecules, leading to fewer collisions between enzyme and substrate. • Extreme pH values (too acidic or too alkaline): Denatures the enzyme, altering its active site. • Presence of inhibitors: Molecules that bind to the enzyme and reduce its activity. 25. State the importance of the following features in a respiratory surface: i) Moist: A moist surface allows respiratory gases (oxygen and carbon dioxide) to dissolve, facilitating their diffusion across the membrane. ii) Thin epithelium: A thin epithelium provides a short diffusion distance for gases, increasing the rate of gas exchange. 26. a) Define the term Homeostasis: Homeostasis is the maintenance of a stable internal environment in an organism, despite changes in external conditions. b) Briefly explain how amoeba regulates the amount of water in the body when placed in distilled water: When an amoeba is placed in distilled water, water enters its body by osmosis because the distilled water has a higher water potential than the amoeba's cytoplasm. The amoeba uses its contractile vacuole to collect this excess water. The contractile vacuole then contracts and expels the water out of the cell, preventing the amoeba from bursting. That's all for today! Send me the next one 📸

Accepted Answer · 2026-04-26T09:27:05.533Z

You're on a roll — 23. Name the blood vessels that: i) Supply blood to the heart muscles: Coronary arteries ii) Has the lowest concentration of urea: Renal vein (or Hepatic vein, after urea has been removed by the kidneys or before it's formed in the liver, respectively) iii) Has the highest concentration of glucose: Hepatic portal vein (after a meal) or Hepatic artery (delivering oxygenated blood to the liver, which then releases glucose into the hepatic vein). The hepatic portal vein carries glucose-rich blood directly from the intestines to the liver. 24. Three factors that would slow down enzyme activity are: • Low temperature: Reduces kinetic energy of molecules, leading to fewer collisions between enzyme and substrate. • Extreme pH values (too acidic or too alkaline): Denatures the enzyme, altering its active site. • Presence of inhibitors: Molecules that bind to the enzyme and reduce its activity. 25. State the importance of the following features in a respiratory surface: i) Moist: A moist surface allows respiratory gases (oxygen and carbon dioxide) to dissolve, facilitating their diffusion across the membrane. ii) Thin epithelium: A thin epithelium provides a short diffusion distance for gases, increasing the rate of gas exchange. 26. a) Define the term Homeostasis: Homeostasis is the maintenance of a stable internal environment in an organism, despite changes in external conditions. b) Briefly explain how amoeba regulates the amount of water in the body when placed in distilled water: When an amoeba is placed in distilled water, water enters its body by osmosis because the distilled water has a higher water potential than the amoeba's cytoplasm. The amoeba uses its contractile vacuole to collect this excess water. The contractile vacuole then contracts and expels the water out of the cell, preventing the amoeba from bursting. That's all for today! Send me the next one 📸

The student was asked to identify blood vessels based on their function, factors affecting enzyme activity, the importance of respiratory surface features, and define homeostasis.

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The student was asked to identify blood vessels based on their function, factors affecting enzyme activity, the importance of respiratory surface features, and define homeostasis.

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