Human movement is produced by the interaction between the skeletal system and antagonistic muscles acting across joints. Human growth is a permanent, irreversible process that follows an S-shaped (sigmoid) curve with distinct characteristics across different life stages and between genders.
Antagonistic muscles work in pairs across a movable hinge joint to bend and straighten the arm.
Movement in the human body relies on antagonistic muscles working in pairs across movable joints. When one muscle contracts, its partner relaxes.
For example, the biceps contracts and the triceps relaxes to bend the arm, while the triceps contracts and the biceps relaxes to straighten it.
Tendons transfer the force of these contractions from muscles to bones, while ligaments hold bones together. Cartilage and synovial fluid protect the bone ends and prevent friction.
Human growth occurs through cell division, exhibiting an S-shaped (sigmoid) curve characterised by rapid infant and adolescent phases, separated by slower childhood growth, reaching a plateau in adulthood, and ending with negative growth in old age.
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What happens to the biceps and triceps muscles when the arm is straightened?
What are the two main functions of synovial fluid in a joint?
Why are adult males generally taller and bigger than adult females?
Both opposing muscles contract at the same time to create movement.
Antagonistic muscles work oppositely—one contracts while the other relaxes.
Tendons are elastic like rubber bands.
Tendons must be inelastic to effectively transfer the muscular contraction force directly to the bone.
Movable and immovable joints are the same.
Movable joints allow limb mobility (such as the elbow hinge joint), whereas immovable joints (such as skull sutures) do not allow movement.
1 Which tissue connects a skeletal muscle to a bone and transfers contraction force?
2 During which age period do females typically grow more rapidly and become taller and heavier than males of the same age?
3 The curve showing the stages of human growth forms an S-shape, which is also known as a curve.
4 The tough, flexible tissue that acts as a cushion to reduce friction between bones at a joint is called .
Drag each component to the function or property it matches. On a phone, tap an answer first, then tap a matching box. Tap the Answer Choices area to return a selected item.
Write the correct component next to each function or property.
Answer choices: Ligament • Synovial fluid • Biceps contracts • Triceps contracts
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