Describe how contraction of the diaphragm allows the lungs to fill and how oxygen from inhaled air enters the lungs.
To determine:
The contraction of diaphragm leads to inhalation.
Introduction:
There are two lungs in the chest cavity that are the primary organs of the respiratory system. There are other components of the respiratory system that transport air to the lungs. These components include trachea and pharynx. The trachea branches into small structures termed as bronchi.
Explanation of Solution
The process of breathing involves two processes, inhalation and exhalation. During exhalation, the carbon dioxide is moved out of the body via the nostrils. During inhalation, the oxygen is moved into the body via the nostrils. The processes of inhalation and exhalation are regulated by the movement of the diaphragm.
When the person inhales the air, the diaphragm contracts and pulls downwards. This leads to the rise and outward movement of the rib’s muscles. It increases the space in the thoracic cavity and decreases the pressure inside. So, when the air pressure in the alveoli decreases down to the atmospheric pressure, the air rushes inside the lungs and fills it.
During inhalation the diaphragm contracts. This leads to the increased space in the thoracic activity and the air rushes into the lungs.
Want to see more full solutions like this?
Chapter 19 Solutions
EBK BIOLOGY
Additional Science Textbook Solutions
Microbiology with Diseases by Taxonomy (5th Edition)
Human Physiology: An Integrated Approach (8th Edition)
Campbell Biology: Concepts & Connections (8th Edition)
Human Physiology: An Integrated Approach (7th Edition)
Biology: Concepts and Investigations
- Which is the order of airflow during inhalation? a. nasal cavity, trachea, larynx, bronchi, bronchioles, alveoli b. nasal cavity, larynx, trachea, bronchi, bronchioles, alveoli c. nasal cavity, larynx, trachea, bronchioles, bronchi, alveoli d. nasal cavity, trachea, larynx, bronchi, bronchioles, alveoliarrow_forwardThe respiratory system_______. a. provides body tissues with oxygen b. provides body tissues with oxygen and carbon dioxide c. establishes how many breaths are taken per minute d. provides the body with carbon dioxidearrow_forwardOxygen in air must diffuse across______ to enter the blood. a. pleural sacs b. alveolar sacs c. a moist respiratory surface d. both b and carrow_forward
- During inhalation, ________. a. the thoracic cavity expands d. the diaphragm relaxes c. atmospheric pressure declines d. the lungs deflatearrow_forwardWhat drives oxygen from the air spaces in alveoli, through tissue fluid, and across capillary epithelium? What drives carbon dioxide in the opposite direction?arrow_forwardA contraction of the smooth muscle in the walls of the bronchi and bronchioles that tighten and squeeze the airway shut is known as a/an ______________arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningBasic Clinical Lab Competencies for Respiratory C...NursingISBN:9781285244662Author:WhitePublisher:Cengage