Download MEHNOOR TAFEEM - CK12 Lesson ELEVEN (11) - 15788428.2

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.