PATHfit Reviewer Flashcards
Study of the structure and function of muscles in the human body.
Muscle Anatomy
Key components of muscles
Muscle Fibers
Fascia
Tendons
Basic building blocks of muscles.
Muscle Fibers
Long cylindrical cells that contains specialized proteins that contract and relax to produce movement
Myofibrils
Refers to the connective tissue that surrounds and separate muscles and other internal structures.
Fascia
Are strong fibrous connective tissue that connect muscles to bones. They transfer the force generated by muscle contraction to produce movement.
Tendons
Types of muscles
Cardiac muscles
Skeletal muscles
Smooth muscles
Only found in the heart. They are responsible for the contraction and popping of the heart. Helping to circulate blood throughout the body.
Cardiac muscles
Attached to the bones and help the body move. They are under voluntary control and are the most common type of muscles in the human body.
Skeletal muscles
Found in the walls of internal organs such as the stomach intestines and blood vessels. They move involuntary and control various internal processes.
Smooth muscles
Functions of muscles
Movement
Stability and posture
Heat production
Protection
Contracting and relaxing and response to nerve signals. This allow for locomotion, maintaining posture, in carrying out voluntary activities.
Movement
Muscles provides the ability and support to the skeletal system, allowing individuals to maintain balance and posture.
Stability and posture
Muscle contractions generate heat, contributing to body temperature.
Heat production
Muscle protect vital organs, such as the heart and lungs, by forming layers of muscles tissues around them.
Protection
The nervous system signals the muscles to contract, and calcium is released to trigger actin myosin interaction
Contraction process
After the nervous signal ceases, the calcium is reabsorbed, in the muscle fibers return to this original state.
Relaxation process
Common muscle injuries
Sprain
Strain
Muscle tears
Can occur due to over exertion improper use of muscles or insufficient warm up
Muscle tears
Prevention tips
Proper warm up
Maintain good posture
Regular stretching
How many muscles in the human body
About 600 muscles
The largest muscles in the body
Gluteus maximus
Strongest muscles in the body
Masseter
A muscle within the ear. The smallest muscle in the body
Stapedius
The weakest muscle in the body
Stapedius
A partial or complete break in the bone
Fracture
A separation of two bones where they meet at a joint
Dislocation
An injury to the ligament around a joint
Sprain
When a muscle or tendon is stretched too far
Strain
Muscle to bone
Tendon
Muscle to muscle
Ligaments
How muscle moves
Cerebral cortex
Spinal nerves
Muscle innervation
A structure deep in your brain, acts as body smart control coordinating center
Hypothalamus
Various actions or motions that can be performed by the body’s joints and muscles
Anatomical movement
Bending movement that decreases the angle between two body parts. Occurs in sagittal plane
Flexion
Straightening or increasing the angle between two body parts. Occurs in sagittal plane
Extension
Bending or tilting a body sideways. Occurs in frontal plane
Lateral flexion
Takes a body part away from the midline of the body. Occurs in frontal plane
Abduction
Brings a body part closer to the midline of the body. Occurs in frontal plane
Adduction
Movement of a body part around its own axis
Rotation
Rotating a body part towards the midline of the body or its axis. Occurs in transverse plane
Internal rotation
Rotating a body part away from the midline of the body or its axis. Occurs in transverse plane
External rotation