The gland that is both exocrine and endocrine in function is the:
A. Thyroid
B. Pancreas
C. Pituitary
D. Adrenal
Answer: Option B
Solution (By JKSSB Mock Tests)
The pancreas functions as an exocrine gland (secreting digestive enzymes into the duodenum via the pancreatic duct) and an endocrine gland (secreting insulin, glucagon, somatostatin from the islets of Langerhans into the blood). Thyroid, pituitary, and adrenals are purely endocrine.
Explanation:
Actin (thin) and myosin (thick) filaments slide past each other during contraction, powered by ATP. Collagen is structural, hemoglobin transports oxygen.
Explanation:
Calcitonin, secreted by parafollicular (C) cells of the thyroid, decreases blood calcium by inhibiting osteoclasts and promoting calcium deposition in bones. Parathyroid hormone (PTH) raises calcium.
Explanation:
A human zygote is diploid (2n = 46), formed by the fusion of a haploid sperm (23) and a haploid ovum (23). It contains 22 pairs of autosomes and one pair of sex chromosomes (XX or XY). Mitotic division then produces all somatic cells. Gametes are haploid (23).
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