The condition caused by excessive secretion of growth hormone in adults is: MCQ with Answer and Explanation

Explanation:
The Foramen of Panizza is a small opening located between the left and right aortic arches at the base of the heart in crocodilians (crocodiles, alligators). It allows blood to flow between the two systemic arches. During diving, when pulmonary resistance increases, this foramen allows deoxygenated blood to bypass the lungs and enter the systemic circulation, conserving oxygen for vital organs. Frogs have a three-chambered heart without this specific foramen.

Explanation:
Dendrites are branched extensions of the neuron cell body that receive synaptic inputs from other neurons and transmit graded potentials towards the soma. The axon conducts action potentials away from the soma to the terminals, which then synapse with other cells. Dendrites have receptor sites for neurotransmitters.

Explanation:
Meiosis I is the reductional division where homologous chromosomes separate, reducing the chromosome number from diploid (2n) to haploid (n). Meiosis II is equational division, similar to mitosis, separating sister chromatids. Thus, reduction occurs in anaphase I. DNA replication occurs in S phase before meiosis I. Gametes are haploid. Errors in reduction can lead to aneuploidy.