Crossword

1 M

Y

O

G

L

O

B

I

N

Y

O

2 S

3 Z

D

I

4 S

C

5 F

U

L

C

R

U

M

A

I

O

6 L

E

V

E

R

B

W

7 F

C

R

L

O

8 C

I

L

I

U

9 M

A

M

L

Y

G

E

O

E

R

10 M

U

S

C

L

E

11 F

I

B

E

R

I

L

A

12 A

C

T

I

N

U

S

M

T

Across:
1	An oxygen-binding pigment that helps store oxygen in muscle tissue.
3	(two words, no space) The disc that separates the sarcomeres in a myofibril.
5	The point around which a lever pivots.
6	A rigid structure that pivots about a fulcrum, and that can either increase the force generated at the expense of speed or increase the speed generated at the expense of force.
8	A hairlike structure found in some eukaryotes that uses a swimming motion to propel the organism or to move fluid past the organism.
10	(two words, no space) The basic unit of muscle tissue, consisting of a collection of myofibrils.
12	A protein found in muscle tissue and in bacterial flagella.

Down:
1	A unit of a muscle fiber consisting of many sarcomeres attached end-to-end.
2	(____ muscle fiber) A type of muscle fiber that is specialized for slow, sustained contraction.
4	A unit of a myofibril consisting of an arrangement of actin and myosin filaments that extends between two Z discs.
7	A hairlike structure found in bacteria and eukaryotes that propels organisms through the water.
9	A protein found in muscle tissue. In the sarcomere, the heads of myosin molecules "walk" along actin filaments to cause contraction.
11	(____ muscle fiber) A type of muscle fiber that contracts quickly, but can sustain a contraction for only a short time.