According to Life123, temperature affects heart rate in ectothermic organisms because they depend on their environment and temperature-controlling systems to determine their own temperature and heart rate. In general, colder temperatures result in lower heart rates and warmer temperatures result in higher heart rates.Know More
Ectothermic organisms move slowly early in the morning. The organism's body temperature is cooler in the morning, which causes its heart rate to be slower. This is due to the cooler atmospheric temperatures the organism is exposed to during the night. As the day moves on, and atmospheric temperatures rise, the ectothermic organism's heart rate increases as the organism's temperature increases. As a result, the ectothermic organism moves around more during the day while temperatures are warmer, notes Life123.
Life123 states that it is hard for ectothermic organisms to regulate their body temperature. It is much more complicated than simply sitting in the sun to warm up or sitting in the shade to cool down. The environment is the leading factor in controlling the temperature of ectothermic organisms. When the weather is not suitable for these organisms, many of them use behavioral techniques to help control their body temperature since these types of organisms do not sweat.Learn more about Zoology
All vertebrates, segmented worms, such as earthworms, and cephalopods, such as squid, have closed circulatory systems. Closed circulatory systems allow larger animals to be much more active than those with open circulatory systems, which are relatively inefficient in delivering oxygen to the organs and muscles.Full Answer >
Annelids and arthropods are similar in that they are both relatively small invertebrate animals with strong and obvious body segmentation, circulatory systems and a one-way gut. Scientists think annelids and arthropods share a common ancestor, or even that annelids are the ancestors of arthropods since there are species such as velvet worms that appear intermediate between them. Unfortunately, the fossil record for annelids is very poor.Full Answer >
Organisms in the Phylum Platyhelminthes, commonly known as flatworms, share several characteristics, including bilateral symmetry, bodies that lack internal cavities and central nervous systems. Flatworms and tape worms vary considerably in appearance but share key biological characteristics that distinguish them from worms and other similar species. These organisms live primarily in dirt and soil and inhabit water and land areas around the world.Full Answer >
Hydra are relatively simple animals without respiratory systems that perform gas exchange wherever their bodies are in contact with water, distributing it through their tissues by simple diffusion. They have only two layers of tissue, the ectoderm that coats their outer bodies and the endoderm that lines their guts, with a gelatinous substance known as the mesoglea between them. The mesoglea is relatively thin in hydra species.Full Answer >