Lesson 21.3: Vocabulary I Name Class Date
Match the vocabulary word with the proper definition.
Definitions
1. muscle tissue that is attached to bone
2. long, thin muscle cell that has the ability to contract, or shorten
3. theory that explains muscle contraction by the sliding of myosin filaments over
actin filaments within muscle fibers
4. tough connective tissue that attaches skeletal muscle to bones of the skeleton
5. human body system that includes all the muscles of the body
6. organs composed mainly of muscle cells
7. the region between two Z lines
8. involuntary, nonstriated muscle that is found in the walls of internal organs
such as the stomach
9. organelles contained within each muscle fiber
10. involuntary, striated muscle found only in the walls of the heart
11. tiny structures within the myosin filaments, that can attach to actin filaments
Terms
a. cardiac muscle
b. cross bridges
c. muscle fiber
d. muscles
e. muscular system
f. myofibril
g. sarcomere
h. skeletal muscle
i. sliding filament theory
j. smooth muscle
k. tendon

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

98 points you will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. before you conduct your experiment, you need to form a hypothesis. a hypothesis is a prediction of what you think will happen in the experiment. the hypothesis is a statement that describes “if” a certain set of circumstances are present “then” there will be a specific result that will occur. record your hypothesis here: record the results from step one of the experiment (dropping the objects in the air): first trial: second trial: third trial: record the results from step two of the experiment (dropping the objects in a vacuum): first trial: second trial: third trial: did the experiment support your hypothesis? using the data from your experiment, describe why you believe your hypothesis was either proven or disproven. what forces were acting on the objects dropped in the air? what force was acting on the objects dropped in the vacuum? part two: comparing forces choose two forces and compare and contrast these forces. you must provide two ways that they are alike and two ways that they are different. you may make a list, write in paragraph form, or make a chart. choose two forces and compare and contrast these forces. these must be different forces than used in the prior question. provide two ways that they are similar and two ways that they are different. you may make a list, write it out, or make a chart.

What do genes contain the code for?