In white blood cells, what contributes to phagocytes?
Lysosomes.
Golgi apparatus
Vacuoles
Endoplasmic reticulum
Correct Answer : A
Lysosomes are organelles that contain enzymes that can break down foreign particles and bacteria.
Phagocytes are a type of white blood cell that use phagocytosis to engulf bacteria, foreign particles, and dying cells to protect the body. They bind to pathogens and internalise them in a phagosome, which acidifies and fuses with lysosomes in order to destroy the contents.
Choice B is wrong because Golgi apparatus is an organelle that modifies, sorts, and packages proteins and other molecules for transport within or outside the cell.
It does not contribute to phagocytosis.
Choice C is wrong because vacuoles are organelles that store water, nutrients, waste products, or other substances.
They do not contribute to phagocytosis.
Choice D is wrong because endoplasmic reticulum is an organelle that synthesizes proteins and lipids, and transports them within the cell.
It does not contribute to phagocytosis.
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Related Questions
Correct Answer is B
Explanation
Lactic acid is a byproduct of anaerobic respiration, which occurs when there is not enough oxygen for the cells to produce energy. Lactic acid accumulates in the muscles and causes a burning sensation.
Choice A is wrong because creatine-phosphate is a molecule that helps regenerate ATP, the main energy source for cells.
Creatine-phosphate does not cause a burning sensation.
Choice C is wrong because adenosine diphosphate (ADP) is a molecule that is converted into ATP by adding a phosphate group.
ADP does not cause a burning sensation.
Choice D is wrong because creatine-phosphate is a molecule that helps regenerate ATP, the main energy source for cells.
Creatine-phosphate does not cause a burning sensation.
Correct Answer is B
Explanation
Choice A is wrong because the thoracic cavity is the upper portion of the trunk, and it contains the heart, lungs, esophagus, and thymus gland.
Choice C is wrong because the pleural cavity is a subdivision of the thoracic cavity, and it contains one lung.
Choice D is wrong because the abdominal cavity is the upper portion of the abdominopelvic cavity, and it contains the stomach, liver, pancreas, spleen, gallbladder, kidneys, small intestine, and most of the large intestine.
Correct Answer is B
Explanation
The correct answer is choice B. Endocrine glands secrete chemicals into the blood. This is because endocrine glands are ductless glands that release their products (hormones) directly into the bloodstream, where they can reach their target cells throughout the body.
Choice A is wrong because salivary glands are exocrine glands, not endocrine glands. Exocrine glands secrete their products into ducts that lead to an internal or external surface.
Choice C is wrong because it describes exocrine glands, not endocrine glands. Exocrine glands release their secretions on an internal or external surface via ducts.
Choice D is wrong because it also describes exocrine glands, not endocrine glands. Endocrine glands do not secrete their products into ducts, but directly into the blood.
Correct Answer is A
Explanation
The urethra is the tube that transports both semen and urine out of the body through the penis. It is part of both the male reproductive system and the urinary system.
Choice A is wrong because the epididymis is a coiled tube that stores and transports sperm from the testes to the vas deferens.
It is only part of the male reproductive system.
Choice C is wrong because the testes are the male gonads that produce sperm and testosterone.
They are also only part of the male reproductive system.
Choice D is wrong because the ureter is a tube that carries urine from the kidney to the bladder.
It is only part of the urinary system.
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