The pivot joint between atlas and axis is a type of
(1) fibrous joint
(2) cartilaginous joint
(3) synovial joint
(4) saddle joint
Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
(1) Calcium
(2) Magnesium
(3) Sodium
(4) Potassium.
Lack of relaxation between successive stimuli in sustained muscle contraction is known as
(1) fatigue
(2) tetanus
(3) tonus
(4) spasm
Which of the following is not a function of the skeletal system?
1. Production of erythrocytes
2. Storage of minerals
3. Production of body heat
4. Locomotion
Sliding filament theory can be best explained as
1. when myofilaments slide pass each other actin filaments shorten while myosin filament do not shorten
2. actin and myosin filaments shorten and slide pass each other
3. actin and myosin filaments do not shorten but rather slide pass each other
4. when myofilament slide pass each other myosin filament shorten while actin filaments do not shorten
Select the correct matching of the type of the joint with the example in human skeletal
system
Types of joint Example
1. Cartilaginous joint Between frontal and parietal
2. Pivot joint Between third and fourth Cervical vertebrae
3. Hinge joint Between humerus and pectoral girdle
4. Gliding joint Between carpals
The characteristics and an example of a synovial joint in humans is
Characteristics | Examples | |
1. | Fluid cartilage between two bones, limited movements | Knee joints |
2. | Fluid filled between two joints, provides cushion | Skull bones |
3. | Fluid filled synovial cavity between two bones | Joint between atlas and axis |
4. | Lymph filled between two bones, limited movement | Gliding joint between carpals |
Which one of the following items gives its correct total number?
1. Floating ribs in humans - 4
2. Amino acids found in proteins -16
3. Types of diabetes - 3
4. Cervical vertebrae in humans - 8
In human body, which one of the following is anatomically correct ?
1. Floating ribs-2 pairs
2. Collar bones-3 pairs
3. Salivary glands-1 pair
4. Cranial nerves-10 pairs
The contractile protein of skeletal muscle involving ATPase activity is :
1. tropomyosin
2. myosin
3. -actinin
4. troponin