Are fish a vertebrate?
Vertebrates include the jawless fish and the jawed vertebrates, which include the cartilaginous fish (sharks, rays, and ratfish) and the bony fish. A bony fish clade known as the lobe-finned fishes is included with tetrapods, which are further divided into amphibians, reptiles, mammals, and birds.
Animals that have a backbone are called vertebrates. The backbone is is a column of bones that supports the body, and also protects the spinal cord. The back is made up of many separate bones, called vertebrae. The backbone is part of a vertebrate's supportive internal skeleton.
- Animals can be classified into two main groups: vertebrates and invertebrates. The main difference between vertebrates and invertebrates is that invertebrates, like insects and flatworms, do not have a backbone or a spinal column. Examples of vertebrates include humans, birds, and snakes.
- You now know that all vertebrates have bones inside their bodies, while invertebrates do not. Every time a vertebrate animal moves, it uses its bones, joints and muscles. In this section we are going to study the bones, joints and muscles that help vertebrates to move.
- Invertebrates are animals that do not have a backbone. Invertebrates come in many shapes and sizes and include insects, spiders and scorpions, crustaceans, such as crabs and lobsters, slugs and snails, jellyfish, and worms. Vertebrates are animals with backbones.
As chordates, vertebrates have the same common features: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. Vertebrates are further differentiated from chordates by their vertebral column, which forms when their notochord develops into the column of bony vertebrae separated by discs.
- Like all chordates, vertebrates have a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. What other characteristics do vertebrates have?
- Animals that have a backbone are called vertebrates. The backbone is is a column of bones that supports the body, and also protects the spinal cord. The back is made up of many separate bones, called vertebrae. The backbone is part of a vertebrate's supportive internal skeleton.
- Characteristics of the Five Vertebrate Groups
- Fish. The body of the fish is covered in scales and has fins attached to help it move through the water.
- Amphibians. The skin of amphibians is very thin and must always be kept wet because amphibians breathe through their skin.
The major function of the vertebral column is protection of the spinal cord; it also provides stiffening for the body and attachment for the pectoral and pelvic girdles and many muscles. In humans an additional function is to transmit body weight in walking and standing.
- The appendicular skeleton, which is attached to the axial skeleton, is formed by the shoulder girdle, the pelvic girdle and the bones of the upper and lower limbs. The human skeleton performs six major functions; support, movement, protection, production of blood cells, storage of minerals, and endocrine regulation.
- The skeletal system is the body system composed of bones and cartilage and performs the following critical functions for the human body:
- supports the body.
- facilitates movement.
- protects internal organs.
- produces blood cells.
- stores and releases minerals and fat.
- The spinal cord carries out two main functions: It connects a large part of the peripheral nervous system to the brain. Information (nerve impulses) reaching the spinal cord through sensory neurons are transmitted up into the brain.
Updated: 25th September 2018