The type of epithelial tissue that lines the respiratory tract and moves mucus is:
A. Squamous epithelium
B. Cuboidal epithelium
C. Transitional epithelium
D. Ciliated columnar epithelium
Answer: Option D
Solution (By JKExamLibrary)
Ciliated pseudostratified columnar epithelium (with goblet cells) lines the trachea and bronchi; the cilia beat in coordinated waves to move mucus and trapped particles out of the airways. Squamous epithelium is flat (alveoli), cuboidal in kidney tubules, transitional in urinary bladder.
Consider statements about human diseases: 1. Typhoid is caused by a bacterium. 2. Malaria is caused by a protozoan. 3. Dengue is caused by a virus. Which are correct?
Explanation:
Typhoid fever is a systemic bacterial infection caused by Salmonella enterica serotype Typhi, transmitted through contaminated food and water. Malaria is a life-threatening disease caused by protozoan parasites of the genus Plasmodium (like P. falciparum), transmitted by Anopheles mosquitoes. Dengue fever is a viral infection caused by the Dengue virus (a flavivirus), transmitted by Aedes mosquitoes. All three statements correctly identify the causative agents of these major diseases.
Explanation:
ANP is secreted by atrial muscle cells of the heart in response to stretching (high blood volume). It promotes sodium and water excretion, lowering blood pressure. Kidneys secrete renin, adrenal aldosterone, liver angiotensinogen.
Explanation:
Follicle-stimulating hormone (FSH) from the anterior pituitary promotes the growth and maturation of ovarian follicles and stimulates estrogen secretion. LH triggers ovulation, estrogen proliferates endometrium, progesterone maintains it.
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