Ceruminous glands secrete:
Sebum.
Ear wax.
Mucus
Keratin
Correct Answer : B
The correct answer is choice B. Ear wax.
Ceruminous glands are specialized sweat glands that are located in the external auditory canal.
They secrete a waxy substance called cerumen or ear wax by mixing their secretion with sebum and dead epidermal cells. Cerumen helps to protect the ear from physical damage and infection.
Choice A is wrong because sebum is secreted by sebaceous glands, not ceruminous glands. Sebum is an oily substance that lubricates and protects the hair and skin.
Choice C is wrong because mucus is secreted by mucous glands, not ceruminous glands. Mucus is a slippery substance that moistens and protects the inner lining of various organs.
Choice D is wrong because keratin is not a secretion, but a protein that forms the structure of hair, nails and skin.
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Related Questions
Correct Answer is A
Explanation
This is a process in which compact and spongy bone develops directly from sheets of mesenchymal (undifferentiated) connective tissue.
Choice A is wrong because vertebrae are formed by endochondral ossification, which is a process in which bone develops from a pre-existing cartilage model.
Choice B is wrong because long bones of arms and legs are also formed by endochondral ossification.
Choice C is wrong because bones of the pelvic girdle are also formed by endochondral ossification.
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
When the sympathetic nervous system is stimulated, it prepares the body for a fight-or-flight response by increasing the heart rate and blood pressure, which results in increased cardiac output.
Cardiac output is the amount of blood pumped by the heart per minute.
Choice B is wrong because increased pancreatic activity is not a result of sympathetic stimulation. The sympathetic nervous system inhibits digestion and reduces blood flow to the gastrointestinal tract.
Choice C is wrong because increased uterine activity is not a result of sympathetic stimulation. The sympathetic nervous system relaxes the smooth muscles of the uterus and other reproductive organs.
Choice D is wrong because increased gastrointestinal activity is not a result of sympathetic stimulation. The sympathetic nervous system inhibits digestion and reduces blood flow to the gastrointestinal tract.
Correct Answer is D
Explanation
The correct answer is choice D. Dermal papillae. Dermal papillae are the projections of the dermis that create the ridges and grooves on the surface of the skin, which are responsible for fingerprints.
Choice A is wrong because Merkel cells are touch receptor cells located at the tip of the epidermal ridges, not the dermal papillae.
Choice B is wrong because arrector pili are smooth muscles attached to hair follicles, which cause goose bumps when contracted, not fingerprints.
Choice C is wrong because sudoriferous glands are sweat glands that secrete fluid onto the skin surface, not fingerprints.
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