23 public questions tagged with this topic.
Alveoli are the primary sites for the exchange of oxygen and carbon dioxide through diffusion. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
Allantois evaginates as endodermal diverticulum from embryonic hindgut surrounded by splanchnic mesoderm, protruding into extraembryonic coelom during day three incubation. Its mesoderm becomes highly vascularized via VEGF signaling, fusing with chorion forming chorioallantoic membrane where fetal vessels appose shell pores for respiratory gas exchange. Distal sac accumulates nitrogenous waste as insoluble uric acid since embryo cannot excrete via yolk. Thus single membrane serves dual physiological roles: waste storage and breathing organ, expanding to occupy most coelom, later contributing to umbilical vessels.
Ref: Gilbert, Developmental Biology, 12th ed., Chapter 12: Allantois - waste storage and gas exchange extraembryonic membrane.
The chorionic villi, which extend into maternal blood spaces, facilitate the exchange of oxygen, nutrients, and waste products between the mother and the fetus.
Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Female Reproductive System and Gametogenesis
Capillaries are thin-walled blood vessels that allow the exchange of gases, nutrients, and waste between blood and tissues.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Capillaries are thin-walled blood vessels that allow the exchange of gases, nutrients, and waste between blood and tissues.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Emphysema is a chronic disorder in which alveolar walls are damaged, reducing the respiratory surface area, often due to smoking.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Disorders - Asthma Emphysema Occupational Disorders
The capillaries surrounding the alveoli facilitate the exchange of oxygen and carbon dioxide between blood and air.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Transport of Carbon Dioxide and Regulation of Respiration
Alveoli are lined with a thin squamous epithelial layer to facilitate efficient gas diffusion.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Transport of Carbon Dioxide and Regulation of Respiration
The alveolar membrane allows efficient diffusion of oxygen into blood and carbon dioxide into the alveoli.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Transport of Carbon Dioxide and Regulation of Respiration
Surfactant is a lipoprotein that reduces surface tension in the alveoli, preventing their collapse during exhalation.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Exchange of Gases and Transport of Oxygen
Gas exchange occurs passively through diffusion, driven by partial pressure gradients of oxygen and carbon dioxide.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Exchange of Gases and Transport of Oxygen
The alveolar walls are composed of a thin squamous epithelial layer to facilitate gas diffusion, not smooth muscle.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Exchange of Gases and Transport of Oxygen
