The Muscular System

Questions and Answers

40%

To pump blood throughout the body

All of the above

Sarcomere Signup and view all the answers

Sliding filament theory Signup and view all the answers

Neuromuscular junction Signup and view all the answers

To move the body's skeleton Signup and view all the answers

To surround internal organs with muscle tissue Signup and view all the answers

Study Notes

The muscular system is a complex system that allows for movement, maintains posture, and regulates body temperature.
It consists of approximately 640 muscles, which make up about 40% of the body's total weight.

Skeletal Muscles (Voluntary Muscles):
- Attached to bones and help move the body's skeleton
- Under conscious control
- Examples: biceps, quadriceps, hamstrings
Smooth Muscles (Involuntary Muscles):
- Found in the walls of hollow organs, such as the digestive tract, blood vessels, and airways
- Not under conscious control
- Examples: muscles in the digestive tract, blood vessels, and airways
Cardiac Muscles:
- Found in the heart
- Responsible for pumping blood throughout the body
- Not under conscious control

Movement: enables movement of the body's skeleton
Support: provides support for the body's posture and balance
Stability: helps maintain joint stability
Regulation of Body Temperature: helps regulate body temperature through muscle contraction and relaxation
Protection: protects internal organs by surrounding them with muscle tissue

Muscle Fiber: the basic unit of muscle tissue
Myofibril: a bundle of muscle fibers
Sarcomere: the functional unit of muscle contraction, consisting of actin and myosin filaments

Sliding Filament Theory: the mechanism of muscle contraction, where actin and myosin filaments slide past each other to shorten the muscle
Neuromuscular Junction: the site where a motor neuron terminates and releases neurotransmitters to stimulate muscle contraction

The muscular system is a complex system that allows for movement, maintains posture, and regulates body temperature.
It consists of approximately 640 muscles, making up about 40% of the body's total weight.

Skeletal Muscles: attached to bones, help move the body's skeleton, and are under conscious control.
Skeletal Muscles Examples: biceps, quadriceps, hamstrings.
Smooth Muscles: found in the walls of hollow organs, not under conscious control, and examples include muscles in the digestive tract, blood vessels, and airways.
Cardiac Muscles: found in the heart, responsible for pumping blood throughout the body, and not under conscious control.

Movement: enables movement of the body's skeleton.
Support: provides support for the body's posture and balance.
Stability: helps maintain joint stability.
Regulation of Body Temperature: helps regulate body temperature through muscle contraction and relaxation.
Protection: protects internal organs by surrounding them with muscle tissue.

Muscle Fiber: the basic unit of muscle tissue.
Myofibril: a bundle of muscle fibers.
Sarcomere: the functional unit of muscle contraction, consisting of actin and myosin filaments.

Sliding Filament Theory: the mechanism of muscle contraction, where actin and myosin filaments slide past each other to shorten the muscle.
Neuromuscular Junction: the site where a motor neuron terminates and releases neurotransmitters to stimulate muscle contraction.