Muscular System Flashcards
1
Q
What are the 4 things the muscular system does?
A
- Move 2. Pump blood 3. Digest food 4. Maintain body temperature
2
Q
How much % of body weight is muscle?
A
50%
3
Q
What is muscle made up of?
A
Protein and waters
4
Q
How many bones are in the human body?
A
650 bones
5
Q
What do muscles do?
A
Enable us to move, maintain posture, and generate heat
6
Q
What are the 3 types of muscles?
A
- Skeletal 2. Cardiac 3. Smooth
7
Q
What are 3 things about skeletal muscle?
A
- Found in limbs 2. Striated, multi-nucleated 3. Voluntary Ex: lifting glass
8
Q
What are 3 things about cardiac muscle
A
- Found in heart 2. Striated, 1 nucleus 3. Involuntary Ex: Heart beating
9
Q
What are 3 things about cardiac muscle
A
- Found in heart 2. Striated, 1 nucleus 3. Involuntary Ex: Heart beating
10
Q
What are 3 things about smooth muscle
A
- Found in blood vessels, intestines, esophagus 2. Not striated, 1 nucleus 3. Involuntary Ex: Peristalsis
11
Q
What are 4 things about skeletal muscle?
A
- Most are attached to tendons to bones 2. Voluntary: subject to conscious control 3. Found in limbs 4. Produce movement, maintain posture, generate heat, stabilize joints
12
Q
What are 2 things about smooth muscle?
A
- Involuntary: no conscious control 2. Found mainly in the walls of hollow internal organs
13
Q
What are 6 things about cardiac muscles?
A
- Involuntary 2. Found only in the heart 3. Main muscle of heart 4. Pumping mass of heart 5. Critical in humans 6. Heart always contracts to its full extent
14
Q
Where does the energy from muscle contractions come from?
A
Mitochondria in muscle cells, which require oxygen
15
Q
When muscles are over-worked, how can they get energy without oxygen?
A
Producing lactic acid
