The scientist who developed the first successful heart-lung machine was: MCQ with Answer and Explanation

Explanation:
A mid-cycle surge in luteinizing hormone (LH) triggers the final maturation and release of the secondary oocyte from the Graafian follicle (ovulation). FSH stimulates follicle growth, estrogen proliferates uterine lining, progesterone maintains it.

Explanation:
Acetylcholine is an excitatory neurotransmitter at neuromuscular junctions and many CNS synapses. GABA and glycine are generally inhibitory in the CNS. Serotonin modulates mood but can have inhibitory or excitatory effects depending on receptors. Neurotransmitters are chemical messengers released from synaptic vesicles into the synaptic cleft to bind to postsynaptic receptors.

Explanation:
Pleiotropy occurs when one gene affects multiple seemingly unrelated traits. Example: phenylketonuria (PKU) affects mental development, skin pigmentation, and musty odor. Marfan syndrome affects skeleton, eyes, and heart. Polygenic is many genes affecting one trait, epistasis is gene interaction, codominance is both alleles expressed.