Biology Chapter 16-1

Biology Chapter 16-1 - • they are born to swim • they...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 16 Section 1- Fish Vertebrates animals with backbones Vertebrates belong to the phylum Chordata. Fishes, amphibians, reptiles, birds, and mammals are vertebrates. The backbone is also called the spinal column. The bones are made of vertebrae. Functions of Vertebrae surround and protect the spinal cord. help support the body. aid in movement. Animals Must Stay Warm There are two ways an animal can stay warm: being endothermic or ectothermic. endotherm - an animal that can use body heat from chemical reactions in the body’s cells to maintain a constant temperature. Used to be called warm-blooded animals. Examples: birds and mammals. They can stay warm in cold weather. ectotherm - an organism that needs sources of heat outside of itself. They depend on their surroundings to stay warm. used to be called cold-blooded animals examples: amphibians, fish, and reptiles. 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Fish Characteristics Fishes come in many shapes, sizes, and colors. There are more than 25,000 species of fishes. They all have the same characteristics:
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: • they are born to swim • they have a brain and senses • they breathe underwater • they reproduce by external fertilization. Born to Swim Fish use fins to steer, stop, and balance. They have 5 sets of fins: pectoral fins- pair just behind gills pelvic fins- pair below dorsal fin- one on top anal fin- one towards the rear tail fin (caudal) - one large fin at the end Brain and Senses All fishes have the sense of vision, hearing, and smell. Most have a lateral line system. lateral line- row of tiny sense organs that detect water vibrations. Breathe Underwater use gills gill- organ in which oxygen from the water is exchanged with carbon dioxide from the blood. 2 Fish Reproduction Most fishes reproduce by external reproduction. The female lays unfertilized eggs in the water. The male drops sperm on them. Some fish reproduce with internal fertilization. Some lay fertilized eggs. Some have the embryos develop inside the female. 3...
View Full Document

{[ snackBarMessage ]}

Page1 / 3

Biology Chapter 16-1 - • they are born to swim • they...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online