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Lesson 11.1 1. What kind of symmetry does the human body plan show? Explain what this means. The kind of symmetry the human body shows is bilateral. Bilateral means if you draw a line head to foot the left and right halves appear as mirror images to each other. 2. How does this symmetry extend to our senses? They are symmetrically on either side. 3. How much of our body is made of muscle? What does this muscle do? Our body is almost half made of muscle. They manipulate our intricate skeleton. 4. How are oxygen and nutrients delivered to the cells of the body? They are delivered by the heart when it pumps blood for the body. 5. What controls all the activity on the body? How much energy does this organ use? The brain controls all activity on the body. The brain uses as much as ¼ of the body's energy. Review 1. What are the four levels of organization in an organism? The four levels of organization are cells, tissues, organs, and organ systems. 2. List the four types of tissues that make up the human body. The four types of tissues that make up the human body are epithelial, connective, muscle, and nervous tissue. 3. Describe epithelial tissue. Epithelial tissue is made up of cells that line inner and outer body surfaces, such as the linings of internal organs and skin. 4. Give two examples of connective tissue. Tendon and bone. 5. What is the role of the nervous system? The role of the nervous systems is to carry electrical messages. 6. What is the role of the cardiovascular system? The role of the cardiovascular system is to transport oxygen, hormones, and nutrients to the body cells. Also it moves wastes and carbon dioxide away from cells Lesson 11.2 1. List three internal conditions that humans regulate. Three internal conditions that humans regulate are the blood’s pH level, blood glucose, and your internal body temperature. 2. What happens to blood vessels in your body when your internal temperature increases? The blood vessels in your body widen when your internal temperature increases. 3. What happens to blood vessels in your body when your internal temperature decreases? The blood vessels will decrease in diameter size when your internal temperature decreases. 4. What are the roles of insulin and glucagon? What do they help the body regulate? Insulin and glucagon help regulate the glucose level. Insulin helps you take in more glucose and glucagon causes the liver to produce glucose for the blood when there is not enough. Review 1. What is homeostasis? Homeostasis is the ability of the body to maintain a stable internal environment despite a changing environment. 2. What is the difference between negative feedback and positive feedback? Negative feedback is the response to a stimulus that keeps a variable close to a set value; includes regulating body temperatures in humans and positive feedback is the response to an event increases the likelihood of the event continuing. 3. What is a hormone? Hormone is the chemical messenger molecule.