Essay on Frogs

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The two organisms discussed I this report are humans and Frogs. The Taxonomy of an organism includes kingdom, phylum, class, order, family, genus, and species. Humans are classified by the kingdom animalia, phylum chordate, class mammalia, order primates, family hominidae, genus homo, and species homo sapiens. Frogs are classified as kingdom animalia, phylum chordate, and genus and species Rana pipens. A frogs habitat is usually spent on land for most of its adult life. However frogs reproduction and development must take place in water or in a moist place. Some adaptations frogs have that aid in their survival are having thin skin that contains mucus-secreting glands. Also they have two pairs of limbs, which can be used for swimming,…show more content…
     The frog, unlike a human, has only a three chambered heart. The frog only has one lower chamber while a human has two, the right and left ventricle. The frog has one muscular ventricle and two thin-walled atria. Blood that leaved the ventricle enters a large blood vessel that branches into two atria’s. These then divide into many smaller arteries, which then are divided into capillaries. Veins are used to return blood from the capillaries to the heart. The right and left pulmonary veins carry blood from the lungs to the left atrium. As the frog breaths using air with its lungs the blood is oxygenated. Blood from all the other parts of the body is brought back through three large veins into a thin-walled sac. Blood form the sac enters the right atrium. The right and left atria then empty blood into the ventricle. So therefore blood that is pumped out by the ventricle is a mixture of oxygenated blood that is from the left atrium and deoxygenated blood that is from the right atrium. Circulation in humans is a bit different. Humans have a four chambered heart. The two upper, think-walled chambers are the atria. The two lower, thick-walled chambers are the ventricles. The circulatory system consists of two major pathways. Pulmonary circulation, which is the first pathway, carries blood between the heart and the lungs. Systemic circulation, which is the second pathway, carries blood between the heart and
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