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FBISE Biology
Answer: Tall columnar cells line the intestine, where they help in absorption of digested food.
Answer: Ciliated epithelium bearing hair-like cilia lines the respiratory tract and helps sweep mucus and dust upward.
Answer: Nervous tissue is made of neurons that conduct nerve impulses for coordination and control.
Answer: Blood is a connective tissue with a fluid matrix called plasma.
Answer: Red blood cells contain haemoglobin, which binds and transports oxygen.
Answer: White blood cells protect the body by destroying pathogens and producing antibodies.
Answer: Platelets help in blood clotting, preventing excessive blood loss from wounds.
Answer: Plasma is the pale-yellow liquid part of blood in which blood cells are suspended.
Answer: Bone matrix is hardened by deposits of calcium salts such as calcium phosphate, making bones rigid.
Answer: Cartilage is a flexible, semi-rigid connective tissue that supports and cushions joints, the nose and the ears.
Answer: Tendons are tough cords of connective tissue that attach muscles to bones.
Answer: Ligaments are elastic connective tissue bands that join bones to bones at joints.
Answer: Adipose tissue stores fat, provides insulation and acts as an energy reserve.
Answer: Areolar tissue is loose connective tissue that fills spaces and binds organs together.
Answer: Blood is a connective tissue whose matrix is the liquid called plasma.
Answer: Skeletal muscle has light and dark bands (striations) and moves under our conscious control.
Answer: Smooth muscle lines the walls of hollow internal organs like the stomach, intestine and blood vessels.
Answer: Cardiac muscle, which pumps blood, is found only in the walls of the heart.
Answer: Cardiac muscle contracts involuntarily and its branched cells are joined by intercalated discs.
Answer: Smooth muscle cells are spindle-shaped, non-striated and each has a single central nucleus.