Question
$20.00 Frog dissection
- From Biology: General-Biology , Biology: Invertebrate-Life
- Closed, but you can still post tutorials
- Due on Jun. 05, 2011
- Asked on Jun. 02, 2011 at 01:13:02AM
Q:
Really need help, did wrong project and I am behind on a frog dissection lab.
$20.00
Frog Dissection. The Best Answer For You.
- This tutorial was purchased 1 time and rated No Rating by students like you.
- Posted on Jun. 03, 2011 at 05:31:33AM
A:
Preview: ... ventricle and is covered by a membrane called pericardium. A triangular structure called sinus venosus joins the right atrium. It receives blood through the major veins called vena cava. The ventricle opens into a saclike conus arteriosus on the ventral side of the heart. The blood from the heart is carried to all parts of the body by the arteries (arterial system).
The veins collect blood from different parts of body to the heart and form the venous system. Special venous connection between liver and intestine as well as the kidney and lower parts of the body are present in frogs. The former is called hepatic portal system and the latter is called renal portal system. The blood is composed of plasma and cells. The blood cells are RBC (red blood cells) or erythrocytes, WBC (white blood cells) or leucocytes and platelets. RBC’s are nucleated and contain red coloured pigment namely haemoglobin. The lymph is different from blood. It lacks few proteins and RBCs. The blood carries nutrients, gases and water to the respective sites during the circulation. The circulation of blood is achieved by the pumping action of the muscular heart.
Reproductive System
Frogs have well organised male and female reproductive systems. Male reproductive organs consist of a pair of yellowish ovoid testes , which are found adhered to the upper part of kidneys by a double fold of peritoneum called mesorchium. Vasa efferentia are 10-12 in number that arise from testes. They enter the kidneys on their side and open into Bidder’s canal. Finally it communicates with the urinogenital duct that comes out of the kidneys
and opens into the cloaca. The cloaca is a small, median chamber that is used to pass faecal matter, urine and sperms to the exterior. The female reproductive organs include a pair of ovaries . The ovaries are situated near kidneys and there is no functional connection with kidneys. A pair of oviduct arising from the ovaries opens into the cloaca separately. A mature female can lay 2500 to 3000 ova at a time. Fertilisation is external and takes place in water. Development involves a larval stage called tadpole. Tadpole undergoes metamorphosis to form the adult.
Excretory System
The elimination of nitrogenous wastes is carried out by a well developed excretory system. The excretory system consists of a pair of kidneys, ureters, cloaca and urinary bladder. These are comp ...
The full tutorial is about 1919 words long plus attachments.