Veins: Tubes that carry blood from body tissues back to the heart. They contain valves which make the blood flow in one direction. Most veins carry deoxygenated blood.
Arteries: Elastic tubes that contain smooth tissue, with many layers of muscle. The amount of muscle layers controls the diameter of the arteries, and this determines your blood pressure. They carry blood away from the heart. Most carry oxygenated blood.
Lungs-a pair of balloon like forms that are on either side of the heart. When air is breathes in, it goes into the lungs and capillaries, where carbon dioxide is also being released. Watch as I inflate this dissected frog's lungs
Respiratory system- Oxygen is breathed in the nose, and travels down onto the lungs, and goes into the capillaries. This is where the oxygen goes into red blood cells. At the same time, carbon dioxide from red blood cells goes to the capillaries and leaves the same way oxygen came in. Oxygen and carbon dioxide can also come to and from the body through the skin.
Epithelial Tissue- creates a barrier to protect the frog. They make hormones, sweat and enzymes. My example is skin.
Connective Tissue- connects the pancreas to the stomach. Its purpose is to connect tissues, fill up empty space, and keep fat. Other examples are blood, tendons and fat.
Muscle Tissue- tissue that allows for movement. examples of this is skeletal muscle, smooth muscle and cardiac muscle, found in the heart.
Nervous Tissue- Made up of neurons, the nervous tissue works to make the actions of the frog, and the neurons get information from the interior and exterior of the frog. Nerves aren't visible in the photo, but there are nerves in the skin. Nervous tissue is the primary tissue of the central and peripheral nervous systems. Nervous tissue conducts nerve impulses and is composed of neurons.

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