The question asks to identify the double-layered membrane that covers the lungs. This is a direct recall question from human anatomy, specifically the protective coverings of major organs.
Correct Option: A) Pleura is the double-layered membrane that encloses the lungs, protecting them and facilitating smooth movement during respiration.
The question asks to identify the dome-shaped muscle that forms the lower boundary of the thoracic chamber. This requires knowledge of human anatomy, specifically the structures defining the thoracic cavity.
A) Diaphragm — The diaphragm is indeed the large, dome-shaped muscle that forms the floor of the thoracic cavity and separates it from the abdominal cavity. It plays a vital role in breathing.
The question asks about the muscles responsible for initiating inspiration (inhalation). Inspiration is an active process that involves increasing the volume of the thoracic cavity, which in turn decreases the pressure inside the lungs, drawing air in. We need to identify the primary muscles involved in this process.
Correct Option: D) Diaphragm and external intercostal muscles
The contraction of the diaphragm and external intercostal muscles are the primary actions that initiate and drive the process of inspiration by increasing the volume of the thoracic cavity.
This question asks about the typical volume of air exchanged during normal, quiet breathing, which is known as Tidal Volume. To answer this, one needs to recall the standard physiological values for respiratory volumes and capacities.
A) 500 mL is the correct answer because it accurately represents the typical volume of air inspired or expired during normal, quiet breathing (Tidal Volume) in a healthy adult.
This question asks about the average volume of Inspiratory Reserve Volume (IRV) in a healthy adult. To answer this, one needs to recall the standard lung volumes and capacities in human physiology.
B) 2500–3000 mL — This range accurately represents the average Inspiratory Reserve Volume (IRV) in a healthy adult, which is the additional air that can be inhaled after a normal inspiration.
The question asks for the average Expiratory Reserve Volume (ERV) in a healthy adult. This requires knowledge of standard lung volumes and capacities in human physiology.
B) 1000–1100 mL is the correct average range for Expiratory Reserve Volume (ERV) in a healthy adult. This represents the amount of air that can be forcefully exhaled after a normal tidal expiration.