Fish Respiration
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Questions and Answers

Which type of gills are found in most fishes?

  • Internal gills (correct)
  • Cutaneous gills
  • Air breathing gills
  • External gills

    • What are external gills primarily found in?

  • Adult polypterians
  • Larval chondrichthyans (correct)
  • Adult chondrichthyans
  • Adult lungfish

    • Which medium has higher O2 solubility compared to the other?

  • Air
  • Both have equal O2 solubility
  • O2 solubility is not relevant for respiration
  • Water (correct)

    • Which property of water affects the density and viscosity compared to air?

    <p>Viscosity</p> Signup and view all the answers

    Which statement about water breathing is true?

    <p>Lower O2 consumption per unit mass compared to air-breathers</p> Signup and view all the answers

    What is the primary stimulus for respiration in fishes?

    <p>O2</p> Signup and view all the answers

    Which gas has higher solubility in water?

    <p>CO2</p> Signup and view all the answers

    What is the unit of pressure according to Dalton's Law of Partial Pressure?

    <p>atm</p> Signup and view all the answers

    Which type of gill ventilation mechanism is used in fishes?

    <p>Counter current gas exchange</p> Signup and view all the answers

    What is the main purpose of the buccal-opercular pump in fishes?

    <p>Irrigation of internal gills</p> Signup and view all the answers

    Which gas makes up 21% of air?

    <p>Oxygen (O2)</p> Signup and view all the answers

    What is the partial pressure of oxygen (PO2) in air at sea level (760 torr)?

    <p>159 torr</p> Signup and view all the answers

    According to Fick's Law of Diffusion, what is the relationship between the diffusion of gases and the pressure gradient?

    <p>Directly proportional</p> Signup and view all the answers

    Which organ is the most efficient gas exchange organ in vertebrates?

    <p>Gills</p> Signup and view all the answers

    What factors affect the control of blood flow in the fish gills?

    <p>All of the above</p> Signup and view all the answers

    What is the mechanism of oxygen uptake in fish gills that maximizes oxygen uptake?

    <p>Countercurrent exchange</p> Signup and view all the answers

    What is the relationship between lamellar surface area and oxygen demand in fish gills?

    <p>Directly proportional</p> Signup and view all the answers

    What is the purpose of gill remodeling in crucian carp and goldfish exposed to hypoxia?

    <p>Increase oxygen uptake</p> Signup and view all the answers

    What is the primary mechanism of gill ventilation in aquatic organisms?

    <p>Buccal-opercular pump</p> Signup and view all the answers

    Which type of fish uses buccal-parabranchial pump architecture for gill ventilation?

    <p>Elasmobranchs</p> Signup and view all the answers

    Which of the following is a solution for air breathing problems in fish?

    <p>Use other mechanisms of aerial respiration</p> Signup and view all the answers

    What is the main reason why gills are generally reduced in air-breathing fish?

    <p>To prevent water loss</p> Signup and view all the answers

    Which of the following is NOT a mechanism of air breathing in fish?

    <p>Gut respiration</p> Signup and view all the answers

    Which fish species is an obligate air breather?

    <p>Lungfishes</p> Signup and view all the answers

    Which of the following factors does NOT affect oxygen consumption in fish?

    <p>Body size</p> Signup and view all the answers

    Which of the following is NOT a factor affecting oxygen consumption in fish?

    <p>Dissolved oxygen levels</p> Signup and view all the answers

    Which of the following is true about gills in fish?

    <p>They rely solely on RAM ventilation</p> Signup and view all the answers

    Which of the following is NOT an accessory breathing organ in fish?

    <p>Gills</p> Signup and view all the answers

    Which of the following is NOT a solution for air breathing problems in fish?

    <p>Thicker, widely spaced lamellae</p> Signup and view all the answers

    Which fish species ventilates its lung by aspiration?

    <p>Arapaima gigas</p> Signup and view all the answers

    Which of the following is NOT a disadvantage of water breathing for fish compared to air breathing?

    <p>Higher blood PCO2 levels</p> Signup and view all the answers

    Which of the following is NOT a physical or chemical property of water that favors gills as a respiratory organ in fishes?

    <p>Heat conductivity</p> Signup and view all the answers

    Which of the following is a mechanism of gill ventilation in fishes?

    <p>Buccal-opercular pump</p> Signup and view all the answers

    What is the primary stimulus for respiration in fishes?

    <p>Oxygen</p> Signup and view all the answers

    Which of the following factors does NOT affect oxygen consumption in fish?

    <p>Partial pressure of oxygen</p> Signup and view all the answers

    What is the unit of pressure according to Dalton's Law of Partial Pressure?

    <p>atmosphere</p> Signup and view all the answers

    Which of the following is NOT a mode of respiration in fishes?

    <p>External gills</p> Signup and view all the answers

    Which of the following is true about gills in fish?

    <p>They are irrigated mainly via the buccal-opercular pump</p> Signup and view all the answers

    Which of the following is NOT an adaptive significance of external gills in fish?

    <p>Protection against predators</p> Signup and view all the answers

    Which of the following fish species has external gills?

    <p>Chondrichthyan (Protopterus spp) embryo</p> Signup and view all the answers

    Which of the following is NOT a factor affecting oxygen consumption in fish?

    <p>Lamellar surface area</p> Signup and view all the answers

    What is the primary mechanism of gill ventilation in aquatic organisms?

    <p>Buccal-opercular pump</p> Signup and view all the answers

    What is the mechanism of oxygen uptake in fish gills that maximizes oxygen uptake?

    <p>Counter current exchange</p> Signup and view all the answers

    Which type of gill ventilation mechanism is used in fishes?

    <p>Buccal-opercular pump</p> Signup and view all the answers

    Which gas makes up 21% of air?

    <p>Oxygen (O2)</p> Signup and view all the answers

    What is the main reason why gills are generally reduced in air-breathing fish?

    <p>Adaptation to low oxygen environments</p> Signup and view all the answers

    What factors affect the control of blood flow in the fish gills?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of gill remodeling in crucian carp and goldfish exposed to hypoxia?

    <p>Increase lamellar surface area</p> Signup and view all the answers

    Which of the following is NOT a mechanism of air breathing in fish?

    <p>Gut respiration</p> Signup and view all the answers

    Which of the following factors does NOT affect oxygen consumption in fish?

    <p>Hemoglobin concentration</p> Signup and view all the answers

    Which medium has higher O2 solubility compared to the other?

    <p>Water</p> Signup and view all the answers

    What is the purpose of gill remodeling in crucian carp and goldfish exposed to hypoxia?

    <p>To improve oxygen extraction efficiency</p> Signup and view all the answers

    Which fish species is an obligate air breather?

    <p>Lungfish</p> Signup and view all the answers

    What is the main reason why gills are generally reduced in air-breathing fish?

    <p>To conserve energy</p> Signup and view all the answers

    Which organ is the most efficient gas exchange organ in vertebrates?

    <p>Lungs</p> Signup and view all the answers

    What is the primary stimulus for respiration in fishes?

    <p>High carbon dioxide levels</p> Signup and view all the answers

    What is the primary mechanism of gill ventilation in aquatic organisms?

    <p>Buccal-opercular pump</p> Signup and view all the answers

    What factors affect the control of blood flow in the fish gills?

    <p>Water pH and oxygen levels</p> Signup and view all the answers

    Which of the following is NOT an accessory breathing organ in fish?

    <p>Swim bladder</p> Signup and view all the answers

    Which fish species ventilates its lung by aspiration?

    <p>Arapaima gigas</p> Signup and view all the answers

    True or false: Most fishes have internal gills covered by operculum and positioned within gill slits.

    <p>True</p> Signup and view all the answers

    True or false: Water has higher O2 solubility compared to air.

    <p>False</p> Signup and view all the answers

    True or false: The primary stimulus for respiration in fishes is oxygen.

    <p>True</p> Signup and view all the answers

    True or false: Gills are the most efficient gas exchange organ in vertebrates?

    <p>True</p> Signup and view all the answers

    True or false: Lamellar surface area in fish gills is positively correlated with oxygen demand and lifestyle?

    <p>True</p> Signup and view all the answers

    True or false: Air-breathing fishes drown if they are denied access to air?

    <p>True</p> Signup and view all the answers

    True or false: Gills in air-breathing fish are generally reduced in size compared to water-breathing fish?

    <p>True</p> Signup and view all the answers

    True or false: Cutaneous respiration is the primary mechanism of respiration in air-breathing fish?

    <p>False</p> Signup and view all the answers

    True or false: Air-breathing fish have larger lamellar surface area in their gills compared to water-breathing fish?

    <p>False</p> Signup and view all the answers

    True or false: The buccal-opercular pump is the primary mechanism of gill ventilation in air-breathing fish?

    <p>True</p> Signup and view all the answers

    Study Notes

    Respiratory System in Fishes

    • Most fishes have internal gills covered by an operculum and positioned within gill slits.
    • External gills are primarily found in larval fishes and some primitive species.
    • Water has lower O2 solubility compared to air.
    • The primary stimulus for respiration in fishes is CO2, not oxygen.
    • The partial pressure of oxygen (PO2) in air at sea level is 160 torr.
    • The unit of pressure according to Dalton's Law of Partial Pressure is torr.
    • Fishes use a buccal-opercular pump mechanism for gill ventilation.
    • The main purpose of the buccal-opercular pump is to facilitate gas exchange in fishes.
    • Oxygen makes up 21% of air.
    • The most efficient gas exchange organ in vertebrates is the lung, not the gills.
    • Factors affecting the control of blood flow in the fish gills include CO2, pH, and temperature.
    • The mechanism of oxygen uptake in fish gills that maximizes oxygen uptake is the buccal-opercular pump.
    • There is a positive correlation between lamellar surface area and oxygen demand in fish gills.
    • Gill remodeling in crucian carp and goldfish exposed to hypoxia serves to increase the diffusion capacity of the gills.

    Air-Breathing Fishes

    • Air-breathing fishes have reduced gills compared to water-breathing fish due to the higher oxygen availability in air.
    • The primary mechanism of gill ventilation in air-breathing fishes is the buccal-parabranchial pump architecture.
    • Some air-breathing fishes, like the African lungfish, ventilate their lungs by aspiration.
    • Oxygen consumption in fish is affected by factors such as temperature, pH, and CO2 levels.
    • The snakehead fish is an obligate air breather.

    Comparative Respiratory Systems

    • Gills are generally reduced in air-breathing fish due to the higher oxygen availability in air.
    • The buccal-opercular pump is not the primary mechanism of gill ventilation in air-breathing fish.
    • Cutaneous respiration is not the primary mechanism of respiration in air-breathing fish.
    • Air-breathing fishes do not drown if denied access to air.
    • Air-breathing fish have reduced lamellar surface area in their gills compared to water-breathing fish.

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    Description

    Test your knowledge on respiration in fishes with this quiz! Learn about the adaptive significance of internal and external gills, the physical and chemical properties of water favoring gills as a respiratory organ, the anatomy and function of gills, counter current gas exchange, mechanisms of gill ventilation, and other modes of respiration such as cutaneous and air breathing. Join us for this informative quiz and expand your understanding of fish respiration.

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