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Which of the following is NOT an example of connective tissue in the human body?
Blood
Bone
Cartilage
Cardiac muscle
Cardiac muscle
Cardiac muscle is a type of muscular tissue, not connective tissue. Connective tissues are characterized by cells separated by an extracellular matrix, whereas muscle tissues are characterized by their contractility due to proteins like actin and myosin.
Cardiac muscle is a type of muscular tissue, not connective tissue. Connective tissues are characterized by cells separated by an extracellular matrix, whereas muscle tissues are characterized by their contractility due to proteins like actin and myosin.
Think of connective tissue as the 'mortar' between bricks (cells) in a wall, while muscle tissue acts like a 'rubber band' that can stretch and contract to create movement.
Connective tissues are 'BC-B-AF' (Blood, Cartilage, Bone, Adipose, Fibrous).
Work=Force├ЧDisplacement тАФ represents the mechanical work performed by muscle tissues.
Connective tissues are formed by cells embedded in a matrix of fibers and ground substance, which provides structural support and links other tissues. Muscle tissues, including cardiac muscle, rely on the sliding filament model where myosin heads pull actin filaments to produce contraction via ATP hydrolysis: ATPтЖТADP+Pi+Energy.
Connective tissues typically contain a non-living extracellular matrix consisting of ground substance and protein fibers (collagen, elastin).
Cardiac muscle is unique as it is involuntary, striated, and contains intercalated discs for synchronized contraction.
Blood is considered a fluid connective tissue because it consists of cells (RBCs, WBCs) suspended in a liquid matrix called plasma.
Connective tissue provides structural integrity and defense against pathogens.
Muscle tissue enables internal transport and body movement.
Connective tissue disorders (like Marfan syndrome) arise from mutations in matrix proteins.
Bones provide structural support for the human skeleton.
Cardiac muscle ensures the continuous, involuntary pumping of blood by the heart.
Cardiac muscle cells contain a high density of mitochondria to ensure continuous aerobic respiration for the heart.
Option A (Blood), B (Bone), and C (Cartilage) all contain specialized cells situated within a non-cellular matrix, classifying them as connective tissues.
D is correct тАФ Cardiac muscle is classified as muscle tissue because its primary function is contraction, distinct from the structural support function of connective tissue.
In competitive exams, always distinguish between tissue types based on their primary function: connective tissues = support/binding, muscle = movement, nervous = communication, and epithelial = covering/protection.