Lesson 21.3: Vocabulary I Match the vocabulary word with the proper definition.

Definitions

H 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

In tossing one coin 10 times, what are your chances for tossing a head? a tail? 2. in tossing one coin 100 times, what are your chances for tossing a head? a tail? 3. in tossing one coin 200 times, what are your chances for tossing a head? a tail? deviation = ((absolute value of the difference between expected heads and observed heads) + (absolute value of the difference between expected tails and observed tails)) divided by total number of tosses. this value should always be positive. 4. what is the deviation for 10 tosses? 5. what is the deviation for the 100 tosses? 6. what is the deviation for 200 tosses? 7. how does increasing the total number of coin tosses from 10 to 100 affect the deviation? 8. how does increasing the total number of tosses from 100 to 200 affect the deviation? 9. what two important probability principles were established in this exercise? 10. the percent of occurrence is the obtained results divided by the total tosses and multiplied by 100%. toss the coins 100 times and record your results. calculate the percent occurrence for each combination. percent head-head occurrence: percent tail-tail occurrence: percent head-tail occurrence:

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

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