Crash Course: Muscles part 1

2. You have ____________________ skeletal muscles. They work by ________________________ bones in different directions.

640, pulling

1. The amazing thing about your muscle tissues is that they turn chemical potential energy into mechanical energy simply by _____________________________ & ____________________________.

Contracting and relaxing

7. When your muscle cells are at rest, your actin and myosin cells ​DO ​/DON'T ​touch.

DON'T

8. When stuff binds to proteins, the proteins change shape. When the action potential reaches the sarcomere, it releases ___________________ which binds to the "body guards", allowing the myosin to bond to __________ and stretch out to connect with the actin. With its energy spent, the myosin releases the ___________ and detaches from the actin, only to bind to another ATP and repeat the process. This process is called the sliding filament model of muscle contraction.

calcium, atp, ADP+P

6. The myofibrils that form your muscle fibers are divided into sections called sarcomeres that contain two different types of proteins (myofilaments) call __________________________ & ________________________.

myosin and actin

3. You muscles are energy hogs. Each one is rigged up with its own personal ______________ to stimulate contraction and its own ____________________ and vein to keep it well fed.

nerve, artery

4. A skeletal muscle is constructed like a sturdy piece of __________________.

rope

5. There are two rules when it comes to muscles and they have to do with proteins: 1. Proteins like to change ______________________ when stuff binds to them. 2. Changing shapes can allow proteins to _________________________________ with other stuff.

shape, bind or unbind