Module 2 lesson review (50 pts)
directions: after reading the lesson material, answer each question using complete sentences unless otherwise stated.

lesson 2.1 – body systems
2.1 discover 1: organization of the body (8 pts)
1. what are the four levels of organization in an organism?
2. what are the four types of tissue that make up the human body?
3. describe epithelial tissue.
4. give two examples of connective tissue.

2.1 discover 2: take a closer look: muscular system (8 pts)
1. what are muscle fibers?
2. describe voluntary muscle.
3. which two of three types of muscles in the body are involuntary?
4. distinguish between skeletal muscle and smooth muscle.

2.1 discover 3: take a closer look: skeletal system (8 pts)
1. are bones a living organ?
2. what are the three components of the skeletal system?
3. list four functions of the skeletal system.
4. name and describe the two types of tissue that make up a bone.

2.1 discover 4: take a closer look: how they work together (8 pts)
1. how are skeletal muscles attached to the skeleton?
2. explain why many skeletal muscles must work in opposing pairs.
3. list three functions of smooth muscles.
4. what happens when cardiac muscle contracts?

lesson 2.2 – more body systems
2.2 discover 1: take a closer look: cardiovascular system (8 pts)
1. list three components of the cardiovascular system.
2. list the main functions of the cardiovascular system.
3. why does each cell in your body need oxygen?
4. complete this sentence: carry blood full of oxygen from the heart and return oxygen-poor blood back to the heart.

2.2 discover 2: take a closer look: respiratory system (4 pts)
1. what is the difference between external and internal respiration?
2. what is the difference between respiration and cellular respiration?

2.2 discover 3: take a closer look: nervous system (6 pts)
1. what are three functions of the nervous system?
2. what type of signals does the nervous system send? what carries these signals?
3. what are the main organs of the nervous system?

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