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AP Biology Unit 8G: Comparative Physiology: Circulation, Respiration & Gas Exchange — practice questions — page 2

Explore 64 free Unit 8G: Comparative Physiology: Circulation, Respiration & Gas Exchange questions in AP Biology Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 8G: Comparative Physiology: Circulation, Respiration & Gas Exchange questions and exercises with answers

Showing questions 31–60 of 64.

Carbon monoxide poisoning is dangerous because CORead the answer and worked solution →The lifespan of a human red blood cell (erythrocyte) is approximately:Read the answer and worked solution →A person with blood group AB is considered:Read the answer and worked solution →The most ABUNDANT type of WBC in human blood is:Read the answer and worked solution →The mammalian heart has how many chambers?Read the answer and worked solution →In a typical ECG, the QRS complex represents:Read the answer and worked solution →A normal resting blood pressure is approximately:Read the answer and worked solution →Pop only the photosynthetic pigments.Read the answer and worked solution →Match each blood vessel type to the direction it carries blood.Read the answer and worked solution →Match each digestive site to its enzyme / secretion.Read the answer and worked solution →NEET · Biology · Blood Component ↔ FunctionRead the answer and worked solution →NEET · Biology · Blood Flow Through the HeartRead the answer and worked solution →CLASS10 · Biology · Life Processes — True or FalseRead the answer and worked solution →CLASS10 · Biology · Digestion — Path of FoodRead the answer and worked solution →CLASS10 · Biology · Heart — Blood Flow SequenceRead the answer and worked solution →CLASS10 · Biology · Aerobic or AnaerobicRead the answer and worked solution →The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct oneRead the answer and worked solution →Which part of alimentary canal receives bile from the liver?Read the answer and worked solution →In which part of the alimentary canal food is finally digested?Read the answer and worked solution →When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence ofRead the answer and worked solution →During respiration exchange of gases take place inRead the answer and worked solution →In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?Read the answer and worked solution →The filtration units of kidneys are calledRead the answer and worked solution →The blood leaving the tissues becomes richer inRead the answer and worked solution →Which of the following is an incorrect statement?Read the answer and worked solution →The internal (cellular) energy reserve in autotrophs isRead the answer and worked solution →Choose the event that does not occur in photosynthesisRead the answer and worked solution →The opening and closing of the stomatal pore depends uponRead the answer and worked solution →Which is the first enzyme to mix with food in the digestive tract?Read the answer and worked solution →Lack of oxygen in muscles often leads to cramps among cricketers. This results due toRead the answer and worked solution →

Worked practice questions

Carbon monoxide poisoning is dangerous because CO

  1. binds haemoglobin much more tightly than O₂
  2. destroys the alveolar wall in minutes
  3. blocks the diaphragm from contracting
  4. raises blood pH to lethal levels
Show answer and solution

Correct answer: A. binds haemoglobin much more tightly than O₂

CO binds haemoglobin's iron with about 240× the affinity of O₂, forming carboxyhaemoglobin that doesn't release CO and doesn't carry O₂. The body suffocates with red, oxygen-starved blood. Treatment is 100% O₂ or hyperbaric oxygen to displace the CO.

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The lifespan of a human red blood cell (erythrocyte) is approximately:

  1. 60 days (about two months)
  2. 120 days (about four months)
  3. 240 days (about eight months)
  4. 360 days (about one year)
Show answer and solution

Correct answer: B. 120 days (about four months)

RBCs live ~120 days in circulation. They are produced in bone marrow (haematopoiesis) and destroyed in the spleen at end of life.

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A person with blood group AB is considered:

  1. Universal donor (A and B antibodies present)
  2. Rh-negative donor (gives to all Rh-)
  3. Universal donor for plasma transfusions
  4. Universal recipient (no anti-A or anti-B)
Show answer and solution

Correct answer: D. Universal recipient (no anti-A or anti-B)

**AB blood:** both A and B antigens on RBCs, no anti-A or anti-B antibodies in plasma. Can receive blood of any ABO group = UNIVERSAL RECIPIENT. O = universal donor (no antigens).

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More Biology topics

Unit 5C: Non-Mendelian Genetics & Population TransmissionUnit 2B: Membrane Transport, Tonicity & Cell SizeUnit 8K: Human Organ Systems & HomeostasisUnit 3B: Photosynthesis, Respiration & Cellular EnergyUnit 7B: Population Genetics & Hardy-Weinberg EvolutionUnit 2G: Osmoregulation & Membrane DynamicsUnit 8R: Environmental Pollution & Organismal HealthUnit 5D: Organismal Reproduction & Life Cycles