Chapter 9 The Muscular System 2023

Front

How many muscles are in the skeletal system?

Back

There are 640 muscles in the skeletal system.

Front

What are the individual muscle fibers (cells) that are arranged in bundles called?

Back

Individual muscle fibers arranged in bundles are called fascicles.

Front

Which type of muscle is NOT striated?

Back

Smooth muscle is the type of muscle that is not striated.

Front

What is the protein that covers the binding site on actin when a muscle is relaxed?

Back

The protein that covers the binding site on actin when a muscle is relaxed is called tropomyosin.

Front

What is the order of muscle structures from largest to smallest?

Back

The order from largest to smallest is: Whole muscle, muscle fascicle, muscle fiber, myofibril, myosin & actin.

Front

What is the primary function of skeletal muscle?

Back

The primary function of skeletal muscle is to facilitate movement of the body by contracting and pulling on bones.

Front

What are the three types of muscle tissue?

Back

The three types of muscle tissue are skeletal, cardiac, and smooth muscle.

Front

What is the role of myosin in muscle contraction?

Back

Myosin is a protein that interacts with actin to produce muscle contraction through the sliding filament mechanism.

Front

What is the function of the sarcoplasmic reticulum in muscle cells?

Back

The sarcoplasmic reticulum stores calcium ions, which are essential for muscle contraction.

Front

What is the neuromuscular junction?

Back

The neuromuscular junction is the synapse or connection point between a motor neuron and a skeletal muscle fiber.