Bio unit 8-9 Respiratory system

nasal cavity

hollow space behind the nose

sense of smell

nose

External part of the respiratory system

The nose is the body's air filter and scent detector.

Pharynx

a shared pathway for air and food, helping direct them into the respiratory or digestive tracts. It also plays a role in speaking and immune defense.

Throat

Larynx

also known as the voice box, is a short passageway located in the neck. It connects the pharynx (throat) to the trachea (windpipe) and plays a critical role in breathing, voice production, and protecting the airway during swallowing.

Trachea

commonly known as the windpipe, is a tube-like structure that connects the larynx (voice box) to the bronchi, allowing air to pass to and from the lungs.

Bronchi

The main air passages that branch off from the trachea and lead into the lungs, allowing air to be distributed throughout the lungs.

Bronchioles

the smallest airways in the lungs that branch off from the tertiary (segmental) bronchi. They play a vital role in directing air to the alveoli, where gas exchange occurs.

alveoli

tiny air sacs in the lungs where the actual gas exchange between air and blood occurs. They are the final and most critical part of the respiratory system.

Diaphragm

a dome-shaped muscle located below the lungs that plays a crucial role in breathing. It separates the thoracic cavity (chest) from the abdominal cavity.

How do the carduivascular and respiratory systems work together to deliver oxygen to the body?

Respiratory System- Brings in oxygen and removes carbon dioxide from the lungs

Cardiovascular System

Transports oxygen and carbon dioxide in the blood to and from body tissues

Explain negative pressure breathing- inhale vs. exhale (pressure vs. volume)

Negative pressure breathing is the process by which air flows into the lungs during inhalation and out during exhalation. It is called "negative pressure" because the pressure inside the lungs becomes lower than the atmospheric pressure, which allows air to be drawn in.