Locomotion and Movement

Movement is a fundamental characteristic of living organisms, exhibited by both animals and plants. It takes place in various forms, ranging from simple protoplasm in Amoeba to the movement of cilia, flagella, and tentacles in many organisms. Human beings have the ability to move their limbs, jaws, eyelids, tongue, and other organs with voluntary muscles. In these, some movements involve changing position or location and are known as locomotion. Locomotion includes walking, running, climbing, flying, and swimming.

The structures involved in locomotion may also play a vital role in other types of movement. For instance, in Paramecium, cilia assist in both food movement and locomotion. Hydra uses its tentacles for capturing prey and locomotion. Limbs are used by humans for changes in body posture and locomotion. These observations indicate that movements and locomotion are interconnected. So, it can be stated that “While all locomotions are movements, not all movements are locomotions”.

The methods of locomotion adapted by animals vary based on their habitats and specific needs. Generally, locomotion serves purposes such as searching for food, shelter, suitable breeding grounds, favorable climatic conditions, or escaping from predators.

Types of Movement

Cells of the human body exhibit three major types of movements that are amoeboid, ciliary, and muscular.

  • Amoeboid movement is observed in specialized cells like macrophages and leucocytes, as well as in organisms like Amoeba. Amoeboid movement is facilitated by the formation of pseudopodia through the streaming of protoplasm, with the involvement of cytoskeletal elements like microfilaments.
  • Ciliary movement occurs in internal tubular organs lined by ciliated epithelium. The coordinated movements of cilia in organs like the trachea help remove dust particles and foreign substances inhaled by the atmospheric air. It also facilitates the passage of ova through the female reproductive tract.
  • Muscular movement is responsible for the movement of limbs, jaws, tongue, etc. The contractile property of muscles is used for locomotion and other movements in human beings and most multicellular organisms. Locomotion requires coordination between the muscular, skeletal, and neural systems.

NCERT Notes for Class 11 Biology Chapter 17: Locomotion and Movement

NCERT and CBSE Notes for Class 11 Biology Chapter 17: Locomotion and Movement: The given article is a detailed introduction to the class 11 chapter “Locomotion and Movement”. The article discusses all the important topics and their related sub-topics which include muscles, types of muscles, muscle contraction, skeletal system, and a brief illustration of different types of bones present in the human body. 

Notes on Locomotion and Movement of NCERT Class 11 The article also looks into the structure of contractile protein and its functioning. A bunch of frequently asked questions are also included in this article for better understanding.

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Locomotion and Movement

Movement is a fundamental characteristic of living organisms, exhibited by both animals and plants. It takes place in various forms, ranging from simple protoplasm in Amoeba to the movement of cilia, flagella, and tentacles in many organisms. Human beings have the ability to move their limbs, jaws, eyelids, tongue, and other organs with voluntary muscles. In these, some movements involve changing position or location and are known as locomotion. Locomotion includes walking, running, climbing, flying, and swimming....

Muscles

Muscle is a specialized tissue derived from the mesoderm. Muscles contribute approximately 40-50% of the body weight of a human adult. While looking into the properties of muscles it can be observed that they are excitable, contractile, extensible, and elastic....

Structure and Mechanism of Contraction

Skeletal muscles are composed of muscle bundles or fascicles held together by fascia. Each muscle bundle contains muscle fibers surrounded by the sarcolemma and sarcoplasm. The sarcoplasmic reticulum stores calcium ions, and myofibrils, composed of myofilaments, give the myofiber a striated appearance. Actin is predominantly found in the I-band, while myosin is primarily located in the A-band. Actin and myosin filaments are parallel to each other and arranged along the myofibril’s longitudinal axis. The Z-line divides the I-band, and the M-line holds the thick filaments together in the A-band. Sarcomeres, located between Z-lines, are the functional units responsible for muscle contraction. In a resting state, thin filaments overlap partially with thick filaments, leaving the H-zone unoverlapped....

Mechanism of Muscle Contraction

The sliding filament theory provides an explanation for muscle contraction, stating that thin filaments slide over thick filaments. Muscle contraction is initiated by a signal from the central nervous system (CNS) transmitted through a motor neuron. The motor neuron and the muscle fibers connect to form a motor unit. At the neuromuscular junction, the point of contact between the motor neuron and the muscle fiber’s sarcolemma, acetylcholine is released as a neurotransmitter, generating an action potential in the sarcolemma....

Skeletal System

The skeletal system is composed of bones and cartilage, which provide a framework for the body and facilitate movement. Bone is a specialized connective tissue with a hard matrix containing calcium salts, while cartilage has a slightly pliable matrix due to chondroitin salts. In humans, the skeletal system consists of 206 bones and a few cartilages. It is divided into two main divisions: the axial skeleton and the appendicular skeleton....

FAQs on Locomotion and Movement

Q1. What is the primary function of the skeletal system?...

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