The waste travels down the ureters from the kidneys to the urinary bladder, where it is kept until it can exit through the cloaca.Ĩ. Q: Trace the path of urine in both sexes.Ī: Liquid wastes travel through the kidneys, where water is filtered from the wastes, and the water is sent back into the body. Eggs pass down through the pair of ovaducts and out of the cloaca.ħ. In the female, the ovaries are located directly beside the kidneys. ![]() Sperm is released directly through the cloaca onto the eggs of the female. Sperm travels through the kidneys into the ureters. Q: Trace the path of sperm in a male and eggs in a female.Ī: A male frog has two testes, which are attached to its kidneys. Air also enters through cuticles in the frogs skin where it is directly absorbed into the bloodstream.Ħ. Firstly, air enters through the nasal cavities and travels into the lungs via the glottis in the mouth, travelling down the trachea. Q: Trace the path of air through the respiratory system.Ī: Air enters the frogs body in two ways. The blood then either go to the lungs to gain more oxygen or throughout the body to the muscles.ĥ. This semi-oxygenated blood is sent out of the hearth through the main artery. This blood mixes with oxygenated blood from the left atrium in the ventricle. Q: Trace the path of blood through the circulatory system, starting at the right atrium.Ī: Deoxygenated blood from the body enters into the right atrium. The remaining food enters the large intesting, and travels to the cloaca, where wastes exit the body.Ĥ. ![]() The food then enters into the small intestine, where the nutrients are absorbed into the bloodstream. The food travels down the esophagus to the stomach, where stomach acids digest the food. The food is pulled into the mouth, where it is crushed into smaller bits by the maxillary teeth and swallowed by the pharynx. Q: Trace the path of food through the digestive tract.Ī: The frog catches its food using its tongue. What do the positions of its teeth suggest about how the frog uses them?Ī: The frog uses the volmerine teeth to stab and secure its prey, while its maxillary teeth are used to crush the food before swallowing.ģ. Q: What is the function of the nictitating membrane?Ī: To protect the eye and keep it moist while the frog can still see, instead of blinking like a human.Ģ.
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