Problem 43 - Objective Biology for NEET

Question

Muscular movement are intended to (a) Move the body to adjust to changes in environment (b) Maintain the position of various body parts (c) Both (a) and (b) (d) None of these

Step-by-Step Solution

Answer

(c) Both (a) and (b)

Step 1: Identify the role of muscles in human body

Muscles in the human body serve two main roles: they help to move the body and maintain its posture. So they act in accordance to changes in our environment and also help to sustain the position of various body parts.

Step 2: Match the given options with identified roles

(a) Move the body to adjust to changes in environment and (b) Maintain the position of various body parts each correspond to one of the roles identified in step 1.

Step 3: Final Verification

Therefore, the option (c) Both (a) and (b), which combines the two roles, is the correct answer to the question.

Key Concepts

Muscle Functions

Muscles are essential components of the human body, responsible for various functions that enable us to perform daily activities smoothly. They facilitate movement and help maintain posture, playing a crucial role in overall bodily function. Muscles achieve these functions through contraction and relaxation, which allow bones to move and positions to be maintained.

There are three main types of muscles in the body:

• Skeletal Muscles: These are attached to bones and help in voluntary movements like walking and writing.
• Cardiac Muscles: Found only in the heart, they are responsible for pumping blood throughout the body.
• Smooth Muscles: Present in internal organs, they help in involuntary actions like digestion and regulating blood flow.

Understanding muscle functions is fundamental to learning how movement and posture are maintained. They work together, controlled by the nervous system, ensuring that muscles contract and relax as needed.

Body Movement

Body movement is a core function facilitated by muscles, allowing us to navigate and interact with our environment. Through muscle contractions, we can perform a variety of actions ranging from simple tasks such as picking up objects to more complex movements like dancing or playing sports.

Movement is possible due to the coordination between the musculoskeletal system and the nervous system. Skeletal muscles, attached to bones, are activated through signals from the nervous system, leading to coordinated contractions. This results in the movement of bones at joints. Some important aspects of body movement include:

• Flexibility: The range of motion joints and muscles can achieve.
• Strength: The power muscles exert to move or stabilize the body.
• Endurance: The ability to sustain prolonged physical activity.

All these aspects of movement are significant as they affect our capability to perform daily activities and adapt to the environment efficiently.

Posture Maintenance

Maintaining posture involves the ability to hold our bodies in a stable position despite the constant pull of gravity. Good posture is crucial as it contributes to bodily alignment and overall health.

Muscles, particularly those in the back, abdomen, and lower limbs, play a vital role in supporting posture. They work tirelessly, even when you are standing still, to keep your body balanced. Here are some key points about posture maintenance:

• Core Stability: Strong core muscles help support the spine and maintain alignment.
• Balance: Muscles coordinate to ensure stability and prevent falls.
• Energy efficiency: Proper posture minimizes fatigue by distributing weight evenly.

Understanding the aspects of posture maintenance helps us recognize its impact on preventing injuries and fatigue, and promoting a healthy lifestyle.