Science Group
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FBISE Biology
Answer: Neurons are the specialized cells of nervous tissue that transmit nerve impulses.
Answer: Dendrites receive signals from other neurons and conduct them toward the cell body.
Answer: The axon is a long fibre that carries nerve impulses away from the cell body to other neurons or effectors.
Answer: The myelin sheath insulates the axon and increases the speed at which impulses are conducted.
Answer: A synapse is the small gap between neurons across which the nerve impulse is transmitted.
Answer: Muscular tissue is made of contractile cells that bring about movement of body parts.
Answer: Skeletal muscle fibres are long, cylindrical and multinucleated, and show distinct striations.
Answer: Smooth muscle in the intestinal wall contracts involuntarily to push food along the digestive tract.
Answer: Red blood cells are the most abundant cells in blood, making up the largest proportion of blood cells.
Answer: Mature human red blood cells are biconcave discs without nuclei, which increases their surface area for oxygen transport.
Answer: An organ is composed of different tissues organized to perform a particular function, such as the heart or stomach.
Answer: The kidney is an organ made of several tissues, whereas muscle, blood and bone are tissues.
Answer: The digestive system breaks complex food into simple substances that can be absorbed by the body.
Answer: The circulatory system, comprising the heart and blood vessels, transports blood throughout the body.
Answer: The epiglottis closes the opening of the windpipe during swallowing so that food passes only into the oesophagus.
Answer: The respiratory system brings in oxygen and removes carbon dioxide through the lungs.
Answer: Kidneys filter blood to remove waste and form urine, which is expelled through the excretory system.
Answer: The brain, spinal cord and nerves together form the nervous system that controls and coordinates body activities.
Answer: The skeleton gives the body its shape, supports it and protects organs such as the brain and heart.
Answer: The endocrine system is made of ductless glands that release hormones into the blood.