Giving an example in each case, explain how large surface; volume ratio, has been achieved n organisms, for exchange of gases and food materials.
For exchange of gases, a large area to volume ratio has been achieved in the following ways among different organisms.
- Use of the cell surface membrane for gaseous exchange in unicellular organisms such as amoeba. Such organisms naturally have a large area to volume ratio because of their small size so that diffusion across the cell surface membrane can suffice their respiratory needs.
- In mammals, the respiratory surface is thrown into numerous spherical folds, called alveoli. These greatly increase the surface area over which exchange of gases can occur.
- In aquatic organisms such as fish, the respiratory surface is formed of highly folded lamellate structures called gills. This also increases the surface area over which gaseous exchange can take place.
- In insects, a highly branched system to tubes, called trachea ramifies through all the body tissues so as to increase the surface area over which gaseous exchange between the tissues and the respiratory surface
- In plants, leaves are numerous, flattened and bear numerous pores, called stomata, in their epidermis. This greatly increases the surface area over which gaseous exchange can take place.
- Tadpole have got external gills to increase surface area for gaseous exchange.
For absorption of food materials, a large surface area to volume ratio has been achieved in the following ways in different organisms.
- In planarian worms, the gut gives off numerous blind-ending branches which ramify throughout the body, penetrating into the tissues. Digested food is forced into these branches by muscular action and is thus conveyed to the cells.
In mammals, such as man, the small intestine (the site of food absorption) is highly elongated and the absorptive surface is thrown into finger like-folds called villi. On the surface of the absorptive cells, the membrane is further highly folded into microvilli. As a result, a large area is presented for the absorption of digested food products
CATEGORIES Bio Questions and answers
TAGS Dr. Bbosa Science
I simply could not depart your web site prior to suggesting that I really enjoyed the standard information a person provide on your guests? Is gonna be again steadily in order to inspect new posts
The very core of your writing while appearing reasonable initially, did not work properly with me personally after some time. Somewhere within the sentences you were able to make me a believer unfortunately only for a short while. I however have got a problem with your jumps in assumptions and one might do well to fill in those gaps. When you can accomplish that, I could surely end up being amazed.
You need to take part in a contest for probably the greatest blogs on the web. I will advocate this website!
I was wondering if you ever thought of changing the layout of your blog? Its very well written; I love what youve got to say. But maybe you could a little more in the way of content so people could connect with it better. Youve got an awful lot of text for only having 1 or two pictures. Maybe you could space it out better?
You can certainly see your skills in the paintings you write. The arena hopes for even more passionate writers such as you who aren’t afraid to say how they believe. All the time go after your heart.
Hi there, just became alert to your blog through Google, and found that it is really informative. I am going to watch out for brussels. I?ll be grateful if you continue this in future. Numerous people will be benefited from your writing. Cheers!
Thanks for the several tips provided on this web site. I have noticed that many insurance carriers offer buyers generous deals if they prefer to insure several cars together. A significant number of households include several cars or trucks these days, specifically those with more mature teenage kids still located at home, and also the savings upon policies may soon mount up. So it will pay to look for a great deal.
I know this if off topic but I’m looking into starting my own blog and was curious what all is required to get set up? I’m assuming having a blog like yours would cost a pretty penny? I’m not very web smart so I’m not 100 sure. Any tips or advice would be greatly appreciated. Cheers
You can definitely see your expertise in the paintings you write. The sector hopes for more passionate writers such as you who are not afraid to mention how they believe. At all times follow your heart.
I am usually to blogging and i actually appreciate your content. The article has actually peaks my interest. I am going to bookmark your web site and preserve checking for brand new information.
Thanks , I’ve just been searching for information about this topic for ages and yours is the greatest I’ve discovered so far. But, what about the bottom line? Are you sure about the source?
Thank you for the auspicious writeup. It in fact was a amusement account it. Look advanced to more added agreeable from you! However, how could we communicate?
I?ve read some good stuff here. Certainly worth bookmarking for revisiting. I surprise how much effort you put to create such a excellent informative web site.
You made some decent factors there. I looked on the internet for the problem and located most individuals will associate with along with your website.
Hi, Neat post. There is an issue along with your web site in internet explorer, could test this? IE still is the market leader and a good element of people will leave out your excellent writing due to this problem.
Things i have observed in terms of pc memory is there are specifications such as SDRAM, DDR and so on, that must fit in with the features of the motherboard. If the personal computer’s motherboard is kind of current and there are no main system issues, updating the memory literally requires under one hour. It’s on the list of easiest computer upgrade types of procedures one can visualize. Thanks for discussing your ideas.
Hello my family member! I want to say that this post is awesome, great written and include approximately all vital infos. I would like to look more posts like this .