Home
Class 12
BIOLOGY
At full muscle contraction the Z-lines a...

At full muscle contraction the Z-lines attached to thin filaments are almost touching

A

A-band

B

I-band

C

Actin fibres

D

H-zone.

Text Solution

Verified by Experts

The correct Answer is:
A
Doubtnut Promotions Banner Mobile Dark
|

Similar Questions

Explore conceptually related problems

During muscle contraction Z-lines get closer.

Statements A-bands of the muscle are dark and contain myosin I-band are the light bands and contain action During muscle contration the A-band contracts The part between the two Z-lines is called as saromere The central part of thin filament, not over-lapped by thick filament is called H-zone of the above statements.

Read the statement regarding myofibril and choose the correct option 1. Each myofibril has alternate dark and light bands. 2. In the centre of each 'A' band is an elastic fibre called 'Z' -line 3. 'A' and 'I' bands are arranged alternately throughout the length of myofibril 4. Sarcomere is the functional unit of contraction 5. Central part of thick filament not overlapped by a thin filament is the 'M' line

In skeletal muscle Z-line is connected to

Go through the following statements During muscle contraction, the width of A-band remains constant while I-band shortens. During muscle contraction, the Ca^(2+) released from the SR bind to the troponin component of thin filament The process of muscle contraction is faster in smooth muscle as they have a well developed sarcoplasmic reticulum. The red muscle fibres have abundant mitochondria, low glycogen and poorly formed sarcoplasmic reticulum.

Which of the following statements are correct regarding muscle proteins ? (i) Actin is a thin filament and is mde up to two F-actin (ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin (iii) Myosin is a thick filament which is also a polymerised protein. (iv) The globular head of meromyosin consists of light meromyosin (LMM).

Read the following statements regarding muscle contraction (i) One ATP utillised for making and breaking of the cross bridge. (ii) The sarcomere lies between 2 Z-lines (iii) Tropomysin blocks the active sites in resting stage (iv) Ca^(++) ions help in unmasking active sites on actin Choose the correct option

Sliding filament theory of muscle contraction was given by (a) Arnon and Hill (b) Huxley and Pullman (c) Huxley and Huxley (d) Pullman and Pullman

Write true or false. If false change the statement so that it is true. (a) Actin is present in thin filament. (b) H-zone of straited muscle fibre represent both thick and thin filaments. (c) Human skeleton has 206 bones. (d) There are 11 points of ribs in man. (e) Sternum is present on the ventral side of the body.

During muscular contraction, which of the following events occur? (i)H-zone disappears (ii) A-band widens (iii) I-band reduces in width (iv) Width of A-is unaffected (v) M-line and Z-line come closer

Home
Profile