Respiratory Membrane - Flashcards
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Questions and Answers

What is the respiratory membrane?

The thin membrane of alveoli where gas exchange takes place.

What are the 3 parts of the respiratory membrane?

Squamous epithelia lining of alveolus, endothelial cells lining an adjacent capillary, and fused basal laminae between alveolar and endothelial cells.

What is diffusion like across the respiratory membrane?

Very rapid because distance is small and gases (O2 and CO2) are lipid soluble.

What is pneumonia?

<p>Inflammation of the lobules.</p> Signup and view all the answers

What happens in pneumonia?

<p>Causes fluid to leak into alveoli and compromises function of respiratory membrane.</p> Signup and view all the answers

What is blood supply like to the respiratory surfaces?

<p>Each lobule receives an arteriole and a venule.</p> Signup and view all the answers

Where do respiratory exchange surfaces receive blood from?

<p>Respiratory exchange surfaces receive blood from arteries of the pulmonary circuit (deoxygenated blood going away from heart).</p> Signup and view all the answers

What surrounds each alveolus to give it blood supply?

<p>A capillary network surrounds each alveolus as part of the respiratory membrane.</p> Signup and view all the answers

Where does blood from the capillaries pass through to return to the heart?

<p>Blood from alveolar capillaries passes through pulmonary venules and veins and returns to the left atrium.</p> Signup and view all the answers

What supplies blood to the lungs?

<p>Capillaries supplied by bronchial arteries provide oxygen and nutrients to tissues of conducting passageways of the lung.</p> Signup and view all the answers

What is blood pressure like in the pulmonary circuit?

<p>Low in pulmonary circuit (30 mm Hg).</p> Signup and view all the answers

What can easily block pulmonary vessels?

<p>Easily blocked by blood clots, fat, or air bubbles.</p> Signup and view all the answers

What is pulmonary embolism?

<p>Blocked blood flow to the lungs - can significantly interfere with O2 uptake.</p> Signup and view all the answers

What are the 2 pleural cavities of the lungs separated by?

<p>Separated by mediastinum.</p> Signup and view all the answers

What is the function of each pleural cavity/what is it lined with?

<p>Holds a lung, is lined with a serous membrane (the pleura).</p> Signup and view all the answers

What are the 2 layers of the pleura?

<p>Parietal pleura, visceral pleura.</p> Signup and view all the answers

What is the function of pleural fluid?

<p>Provides lubrication and surface tension which assists in expansion and recoil of the lungs.</p> Signup and view all the answers

What processes are involved in the process of respiration?

<p>Pulmonary ventilation (breathing), external respiration, transport, internal respiration.</p> Signup and view all the answers

What is pulmonary ventilation?

<p>Movement of air into and out of lungs.</p> Signup and view all the answers

What is external respiration?

<p>O2 and CO2 exchange between lungs and blood.</p> Signup and view all the answers

What is transported in the blood from the respiration processes?

<p>O2 and CO2 in the blood.</p> Signup and view all the answers

What is internal respiration?

<p>O2 and CO2 exchange between systemic blood vessels and tissues.</p> Signup and view all the answers

What is pulmonary ventilation?

<p>The physical movement of air in and out of respiratory tract, provides alveolar ventilation.</p> Signup and view all the answers

What is atmospheric pressure?

<p>The weight of air, has several important physiological effects.</p> Signup and view all the answers

What is Boyle's law?

<p>Defines the relationship between gas pressure and volume.</p> Signup and view all the answers

What is the equation representing Boyle's law?

<p>P = 1/V</p> Signup and view all the answers

What is the inverse relationship of Boyle's law?

<p>Decrease volume of a container, pressure rises; increase volume of a container, pressure falls.</p> Signup and view all the answers

In a contained gas, what happens to pressure?

<p>External pressure forces molecules closer together; movement of gas molecules exerts pressure on the container.</p> Signup and view all the answers

Study Notes

Respiratory Membrane

  • The respiratory membrane is a thin barrier in the alveoli where gas exchange occurs.
  • Composed of three main parts:
    • Squamous epithelium lining of the alveolus
    • Endothelial cells of adjacent capillaries
    • Fused basal laminae between the two cell types.

Gas Exchange

  • Diffusion across the respiratory membrane is very rapid due to small distance and the lipid solubility of O2 and CO2.

Pneumonia

  • Pneumonia is characterized by inflammation of the lung lobules.
  • It causes fluid leakage into the alveoli, impairing the function of the respiratory membrane.

Blood Supply to Lungs

  • Each lung lobule is supplied with an arteriole and a venule.
  • Respiratory exchange surfaces receive deoxygenated blood from the pulmonary circuit.

Surrounding Alveoli

  • A capillary network encircles each alveolus, providing necessary blood supply.

Returning Blood to the Heart

  • Blood from alveolar capillaries flows through pulmonary venules and veins back to the left atrium.

Oxygen and Nutrient Supply

  • Bronchial arteries supply oxygen and nutrients to the lung tissues involved in conducting pathways.

Pulmonary Circuit Pressure

  • Blood pressure in the pulmonary circuit is relatively low at around 30 mm Hg.

Blockage of Pulmonary Vessels

  • Pulmonary vessels can easily be blocked by blood clots, fat, or air bubbles, leading to complications.

Pulmonary Embolism

  • Pulmonary embolism refers to blocked blood flow to the lungs, which can significantly hinder oxygen uptake.

Pleural Cavities

  • The two pleural cavities containing the lungs are separated by the mediastinum.
  • Each pleural cavity holds a lung, lined with a serous membrane called pleura.

Pleural Layers and Function

  • The pleura has two layers:
    • Parietal pleura (outer layer)
    • Visceral pleura (inner layer)
  • Pleural fluid provides lubrication and surface tension, aiding lung expansion and recoil.

Processes of Respiration

  • Key processes involved in respiration include:
    • Pulmonary ventilation (breathing)
    • External respiration
    • Gas transport
    • Internal respiration

Definitions of Respiratory Processes

  • Pulmonary ventilation refers to the movement of air into and out of the lungs.
  • External respiration is the exchange of O2 and CO2 between the lungs and blood.
  • Internal respiration involves O2 and CO2 exchange between systemic blood vessels and tissues.

Alveolar Ventilation

  • Pulmonary ventilation facilitates the physical movement of air in and out of the respiratory tract, ensuring adequate alveolar ventilation.

Atmospheric Pressure

  • Atmospheric pressure is the weight of air exerting physiological effects in the body.

Boyle's Law

  • Boyle's Law describes the relationship between gas pressure and volume; it states that pressure inversely correlates with volume.
  • The law can be represented by the equation P = 1/V.
  • As the volume of a container decreases, the pressure rises; conversely, if the volume increases, pressure falls.

Gas Molecule Movement

  • In a contained gas, external pressure forces molecules closer together, causing increased pressure from their movement against the container.

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Description

Explore key concepts related to the respiratory membrane with these flashcards. Learn about the structure, function, and parts involved in gas exchange within the alveoli. This quiz is essential for students studying human anatomy and physiology.

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