Muscular system Flashcards
1
Q
Muscular system: Components
A
- Cardiac muscle
- Smooth muscle
- Skeletal muscle
2
Q
Muscular system: Functions
A
- Refers to 700+ skeletal muscles attached to bones that primarily aid in movement
- Cardiac muscle tissue and smooth muscle tissue play important functional roles in maintaining homeostasis
- Muscles act to move the body (skeletal muscles), the blood (cardiac muscles) as well as other body fluids and products (smooth muscles)
3
Q
Cardiac muscle: Components
A
- Coronary blood vessels
- Pericardium
- Endocardium
- Myocardium (cardiac muscle)
- Heart wall
4
Q
Cardiac muscle: Function
A
- Contractions pump blood through the body’s blood vessels
- Contractions are involuntary
5
Q
Smooth muscle: Components
A
- Blood vessels
- Uterus
- Stomach
- Gallbladder
- Intestines
- Urinary bladder
6
Q
Smooth muscle: Functions
A
- Contractions move food. bile, and enzymes through the GI tract, gametes through the reproductive system, and urine through the urinary system
- Contractions of blood vessels help regulate the rate of blood flow
- Sphincters in hollow organs regulate the outflow of substances from hollow organs
- Contractions are usually involuntary
7
Q
Skeletal muscle: Components
A
- Shoulder joint
- Origins of triceps brachii from scapula and humerus
- Belly of triceps brachii muscle
- Insertion of triceps brachii on ulna
- Origins of biceps brachii from scapula
- Tendons
- Belly of biceps brachii muscle
- Elbow joint
- Insertion of biceps brachii on radius
- Radius
- Ulna
8
Q
Skeletal muscle: Functions
A
- Contractions in the belly of a muscle produce movement by exerting force on tendons (attached at origins and insertions) which pull on bones, drawing one towards the other
- Contraction stabilize joints and help maintain posture and body positions
- Contractions produce heat, used to maintain body temperature
- Most contractions are voluntary
