The gills are covered by a flexible bony plate called the operculum. Some fish have spines located on the operculum as a defense mechanism to protect them from predators.
What structure covers the gills?
An operculum (gill cover) that is a flexible bony plate that protects the sensitive gills. Water is “inhaled” through the mouth, passes over the gills and is “exhaled” from beneath the operculum.
What is the name of the gill flap in fish?
The operculum is a hard, plate-like, bony flap that covers the gills of a bony fish (superclass: Osteichthyes). It protects the gills and also serves a role respiration. Fish can acquire dissolved oxygen through pumping water over their gills by opening and closing their jaws and opercula.
What do we call the flap over the gills that covers and protects fish?
The operculum is a bony flap of skin over their gills that protects the gills. It opens and closes to help bony fish breathe when they are not swimming. Bony fish have scales, and most species have a fusiform body design. That means their bodies are rounded and tapered at both ends!
What is the name of the hard outer covering that protects the gills?
gill cover (operculum) A hard but flexible cover which, in bony fish, forms the outer wall of the gill chamber. It protects the gills and also plays a major role in the pumping mechanism that regulates the continuous flow of water over them.
Why are gills rich in blood?
The water enters the mouth and passes through the feathery filaments of the fish’s gills, which are rich in blood. These gill filaments absorb oxygen from the water and move it into the bloodstream. … At the same time, waste carbon dioxide in the blood passes out through the gills into the water.
What are gills for Class 4?
A gill is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water and excretes carbon dioxide.
Can fish drown water?
Fish are physically incapable of drowning because they have gills, not lungs. They can die if there’s not enough dissolved oxygen in the water which would make them suffocate, technically. So, if you’ve wondered can fish drown, the answer is no.
What do the gill rakers do?
Gill rakers serve to protect the gill from large debris and to trap food, particularly plankton.
Why are gills in fish highly vascularized?
Answer. The concentration of oxygen in water is lower than air and it diffuses more slowly. … Rather than using lungs “Gaseous exchange takes place across the surface of highly vascularised gills over which a one-way current of water is kept flowing by a specialised pumping mechanism.
What does dorsal fin mean?
: a flat thin part on the back of some fish (such as sharks)
Which fins keeps the fish level in the water and keep it from rolling?
Pelvic fins, located on the bottom of the fish in front of the anal fin, help balance the fish, keep it level, and prevent it from rolling from side to side. Fish sometimes rest by sitting on their pelvic fins.
What does Operculum mean?
noun, plural o·per·cu·la [oh-pur-kyuh-luh], o·per·cu·lums. Botany, Zoology. a part or organ serving as a lid or cover, as a covering flap on a seed vessel. Zoology. the gill cover of fishes and amphibians.
Do fish have brains?
Fish typically have quite small brains relative to body size compared with other vertebrates, typically one-fifteenth the brain mass of a similarly sized bird or mammal. … The cerebellum of cartilaginous and bony fishes is large and complex.
What is a fish skeleton called?
There are two different skeletal types: the exoskeleton, which is the stable outer shell of an organism, and the endoskeleton, which forms the support structure inside the body. The skeleton of the fish is made of either cartilage (cartilaginous fishes) or bone (bony fishes).
Do fishes have hearts?
However, fish have unique hearts. They have one atrium and one ventricle, but they also have two structures that aren’t seen in humans. … As in other animals, the heart drives blood throughout the body. Deoxygenated blood enters the sinus venosus and flows into the atrium, Moore said.