WebFigure 40.2 In (a) closed circulatory systems, the heart pumps blood through vessels that are separate from the interstitial fluid of the body. Most vertebrates and some invertebrates, like this annelid earthworm, have a closed circulatory system. In (b) open circulatory systems, a fluid called hemolymph is pumped through a blood vessel that ... WebAnimals without circulatory systems: Simple animals consisting of a single cell layer, such as the (a) sponge, or only a few cell layers, such as the (b) jellyfish, do not have a circulatory system. Instead, gases, nutrients, and wastes are exchanged by diffusion.

The Cardiovascular System in Fish PetMD

WebFish have single circuit circulation. That is, blood leaves the heart, travels throughout the body, and then returns to the heart. Mammals (and reptiles and birds) have dual circuit circulation: blood is pumped by the heart to the lungs and is oxygenated and then returns to the heart to be pumped again to the other tissues. WebAll animals need to move important fluids through their body. The fluids move through what is called a circulatory system. The fluids carry nutrients and gases, like oxygen, that … birthday wishes for auntie

Class Chondrichthyes – The Biology Classroom

WebThe olfactory, or nasal, organ of fishes is located on the dorsal surface of the snout. The lining of the nasal organ has special sensory cells that perceive chemicals dissolved in the water, such as substances from food material, and send sensory information to the brain by way of the first cranial nerve. Odour also serves as an alarm system. WebCirculatory & respiratory systems The digestive system The excretory system: From your heart to the toilet The skeletal system: It's ALIVE! Big Guns: The Muscular System Your immune system: Natural born killer Great glands - Your endocrine system The reproductive system: How gonads go Old & Odd: Archaea, Bacteria & Protists dan walsh author series