Blowhole: Whales have a specialized blowhole located on the top of their head. This opening allows them to take in air when they surface and expel stale air while underwater. They have a muscular valve that can open and close the blowhole.
Lungs: Whales have large lungs that can store a significant amount of air. This air reserve enables them to hold their breath for extended periods while diving.
Diaphragm: The diaphragm is a sheet of muscle that separates the chest cavity from the abdominal cavity. In whales, the diaphragm is exceptionally strong, allowing them to effectively control the movement of air in and out of the lungs.
Trachea and Bronchi: Whales have a flexible trachea (windpipe) and bronchi that can withstand pressure changes during dives. This prevents water from entering their respiratory system.
Collapsible Rib Cage: Unlike humans, whales have a rib cage that can collapse. When a whale dives, its rib cage compresses, reducing the lung volume. This helps to increase the air pressure within the lungs and prevents water from entering.
Sperm Whales and Deep Diving: Sperm whales, in particular, are known for their deep diving capabilities. They have a specialized structure called the spermaceti organ in their head, which is thought to play a role in echolocation and buoyancy. It also aids in regulating their buoyancy during dives.
In addition, whales have a reflex that triggers their epiglottis to close when water enters their mouth, preventing water from reaching the lungs.
These adaptations work in concert to enable whales to breathe efficiently and safely while underwater, even when engulfing large amounts of water along with their food.
