Muscle Fibre Types - Red and White

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Questions and Answers

What is the function of the 'M' line in the myofibril?

To attach the thick filaments to the 'Z' line

To hold together the thin filaments in the 'I' band (correct)

To connect successive 'Z' lines

To bisect the 'I' band

What is the main reason for the striated appearance of the myofibril?

The presence of the 'Z' line

The distribution pattern of elastic fibers

The arrangement of actin and myosin proteins (correct)

The thin and thick filaments

What is the sarcomere, as mentioned in the text?

The portion of myofibril between two successive 'Z' lines (correct)

The area where actin and myosin proteins interact

The arrangement of thin and thick filaments

The location of the 'I' and 'A' bands

Which type of muscle fibers contain plenty of mitochondria for ATP production?

Red fibers (A) Signup and view all the answers

What is the role of actin and myosin in muscle fibers?

Myosin generates movement, while actin provides structural support (D) Signup and view all the answers

Which type of muscle fibers depend on anaerobic process for energy?

White fibers (C) Signup and view all the answers

How many cranial bones are there in the human skull?

8 (A) Signup and view all the answers

What is the primary role of the skeletal system in the body?

Supporting the body (D) Signup and view all the answers

Which bone is present at the base of the buccal cavity and is included in the skull?

Hyoid bone (A) Signup and view all the answers

How many bones make up the axial skeleton in human beings?

80 bones (D) Signup and view all the answers

How many skeletal elements form the front part of the skull in the facial region?

14 (B) Signup and view all the answers

What is the name of the bone that articulates with the occipital condyles?

Atlas (C) Signup and view all the answers

What causes the shortening of the sarcomere during muscle contraction?

Pulling of the actin filaments towards the center of the A band (C) Signup and view all the answers

What is responsible for the accumulation of lactic acid in muscles during repeated activation?

Anaerobic breakdown of glycogen (A) Signup and view all the answers

What is the role of myoglobin in muscles?

Storing oxygen (B) Signup and view all the answers

What leads to the return of 'Z' lines back to their original position, i.e., relaxation?

Pumping of Ca++ ions into the sarcoplasmic cisternae (B) Signup and view all the answers

Study Notes

Muscle Structure and Function

The 'M' line in the myofibril is where myosin thick filaments are anchored.
The striated appearance of the myofibril is due to the regular arrangement of sarcomeres.
A sarcomere is the functional unit of the myofibril, containing actin and myosin filaments.
Oxidative muscle fibers contain plenty of mitochondria for ATP production.
Actin and myosin filaments slide past each other, causing muscle contraction.
Anaerobic muscle fibers depend on anaerobic processes for energy.

Skeletal System

The human skull consists of 22 cranial bones.
The primary role of the skeletal system is to provide support and protection for the body.
The mandible bone is present at the base of the buccal cavity and is part of the skull.
The axial skeleton in human beings consists of 80 bones.
The front part of the skull in the facial region is formed by 14 skeletal elements.
The atlas bone articulates with the occipital condyles.
During muscle contraction, the shortening of the sarcomere is caused by the sliding of actin and myosin filaments.
Repeated muscle activation leads to the accumulation of lactic acid in muscles.
Myoglobin in muscles stores oxygen for later use.
Muscle relaxation occurs when the 'Z' lines return to their original position, which is caused by the release of calcium ions.

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Description

This quiz covers the different types of muscle fibers, namely red and white fibers, and their characteristics. It explains the presence of mitochondria, myoglobin, and the reliance on aerobic or anaerobic processes in these muscle fibers.