transport systems n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Transport Systems PowerPoint Presentation
Download Presentation
Transport Systems

Loading in 2 Seconds...

play fullscreen
1 / 10

Transport Systems - PowerPoint PPT Presentation


  • 162 Views
  • Uploaded on

Transport Systems. Transport Systems. What type of organisms have transport systems? Why do organisms need a transport system?. Insects. Insects don't have veins or arteries, They do have circulatory systems. An open circulatory system.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Transport Systems' - thais


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
transport systems1
Transport Systems
  • What type of organisms have transport systems?
  • Why do organisms need a transport system?
insects
Insects
  • Insects don't have veins or arteries,
  • They do have circulatory systems.
  • An open circulatory system.
  • Insect blood (hemolymph), flows freely through the body cavity and makes direct contact with organs and tissues.
slide5

A single blood vessel runs along the dorsal side of the insect, from the head to the abdomen.

  • In the abdomen, the vessel divides into chambers and functions as the insect heart
  • Perforations in the heart wall (ostia) allow hemolymph to enter the chambers from the body cavity.
  • Muscle contractions push the hemolymph from one chamber to the next, moving it forward toward the thorax and head.
slide6

Insect blood is only about 10% hemocytes (blood cells); most of the hemolymph is watery plasma.

  • The insect circulation system does not carry oxygen, so the blood does not contain red blood cells as ours does.
  • Hemolymph is usually green or yellow in colour.
closed circulatory systems
Closed circulatory Systems
  • Closed circulatory systems are more efficient than open ones
  • Closed system consists of arteries, veins, and capillaries.
  • Capillaries surround the organs, making sure that all cells have an equal opportunity for nourishment and removal of their waste products
earthworms
Earthworms
  • One of the simplest types of closed circulatory systems is found in annelids such as the earthworm.
  • Earthworms have two main blood vessels -- a dorsal and a ventral vessel -- which carry blood towards the head or the tail, respectively.
  • Blood is moved along the dorsal vessel by waves of contraction in the wall of the vessel.
slide9

In the anterior region of the worm, there are five pairs of vessels, which we loosely term "hearts," that connect the dorsal and the ventral vessels.

  • These connecting vessels function as rudimentary hearts and force the blood into the ventral vessel.
  • Since the outer covering (the epidermis) of the earthworm is so thin moist, there is ample opportunity for exchange of gases, making this relatively inefficient system possible
earthworm quiz
Earthworm Quiz
  • Have a go at this quiz!