The valve between the left atrium and left ventricle is the: MCQ with Answer and Explanation

Explanation:
Luteinizing hormone (LH) binds to Leydig cells in the testes, stimulating them to produce and secrete testosterone. FSH stimulates Sertoli cells for spermatogenesis. GnRH from hypothalamus stimulates release of LH and FSH.

Explanation:
Amoebic dysentery (amoebiasis) is characterized by bloody, mucus-containing stools, caused by Entamoeba histolytica, transmitted through contaminated food/water. Malaria is Plasmodium, sleeping sickness Trypanosoma, leishmaniasis Leishmania.

Explanation:
Diastole is the relaxation phase of the cardiac cycle, during which the ventricles fill with blood from the atria. Systole is the contraction phase, pumping blood out. Atrial contraction (atrial systole) contributes to ventricular filling. Ejection phase is part of ventricular systole when blood is ejected. Normal diastolic and systolic pressures are 80 and 120 mmHg respectively.