Structure

Q.

The "all-or-none" concept of skeletal muscle contraction means that

1. Muscle fascicles contract completely

2. Muscle fibers contract completely

3. All of the actin and myosin molecules contract

4. All muscles contract completely and not partially

Q.

The basic contractile unit of a muscle cell is

1. fascicle

2. sarcomere

3. myofibril

4. muscle fibre

Q.

What is a sarcomere?

1. Part between dark bands

2. Part between light bands

3. A light band and half of the two dark bands

4. A dark band and half of the two light bands.

Q.

Statement 1: Muscle fibres that are seen in the form of bundles in the muscle tissue are called fascicles.

Statement 2: Each muscle fibre has 40 - 80 myofibrils.

1. Both the statements are false

2. Statement 1 is true and statement 2 is false

3. Statement 1 is false and statement 2 is true

4. Both the statements are true

Q. Smooth muscle cells are _________ structures.

1. Striated
2. Unbranched
3. Multinucleated
4. Branched

Q.

Match the terminologies with the correct description.

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{i.Contractility}& \text{a. Stretched muscles recoil to the resting length}\\ \text{ii.Excitability}& \text{b. Muscle can be stretched beyond its resting phase}\\ \text{iii.Extensibility}& \text{c. Muscle responds to stimulus by nerves and hormones}\\ \text{iv.Elasticity}& \text{d. Capacity of muscle to contract or shorten}\end{array}$

1. i).→ c ., ii). → b., iii). → d., iv). → a.

2. i). → d., ii). → c., iii). → b., iv). → a.

3. i). → c., ii). → d., iii). → b., iv). → a.

4. i). → d., ii). → a., iii). → b., iv). → c.

Q.

Which of the following property of muscle is related to nervous stimulation?

1. Contractility

2. Excitability

3. Extensibility

4. Elasticity

Q.

The basic contractile unit of a muscle cell is

1. Muscle fibre

2. Sarcomere

3. Fasicle

4. Myofibril