What protein is arranged along the length of actin filaments and is involved in regulation of skeletal muscle contraction?
1. | Troponin | 2. | Calmodulin |
3. | Tropomyosin | 4. | Light meromyosin |
During relaxation of a skeletal muscle:
1. | Calcium ions that are bound to troponin C now bind to troponin A |
2. | Cross bridge formation between myosin head and actin takes place |
3. | The A band of the sarcomere lengthens |
4. | Calcium ions are pumped back to the sarcoplasmic cisternae |
What type of muscles do you expect to find in the inner walls of hollow visceral organs?
1. | Involuntary, nonstriated | 2. | Voluntary, nonstriated |
3. | Involuntary, striated | 4. | Voluntary, striated |
During muscle contraction, when the myosin head releases ADP and iP it:
1. forms cross bridge with actin
2. pulls actin towards M-line
3. goes back to its relaxed state
4. gets detached from the cross bridge
Muscle weakness because of abnormal neuromuscular junction activity is seen in:
1. | poliomyelitis | 2. | myasthenia gravis |
3. | multiple sclerosis | 4. | muscular dystrophy |
Which of the following masks the active sites on actin when a skeletal muscle is relaxed?
1. | Tropomyosin | 2. | Troponin |
3. | Calmodulin | 4. | Ubiquitin |
All the following are cranial bones except:
1. | Ethmoid | 2. | Sphenoid |
3. | Temporal | 4. | Zygomatic |
During muscle contraction, the event shown in the following diagram describes:
1. cross bridge detachment
2. the power stroke or working stroke
3. cross bridge formation
4. cocking of myosin head
The total number of vertebrosternal and vertebrochondral ribs in human body respectively are:
1. | 7 and 3 | 2. | 14 and 6 |
3. | 3 and 7 | 4. | 6 and 14 |
The total number of phalanges in the human body are:
1. | 14 | 2. | 28 |
3. | 56 | 4. | 7 |