The oxygenated blood first enters the left atrium
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The blood leaves the heart through the aorta, the largest artery in the body. From there, it travels to smaller arteries and arterioles, ultimately reaching the capillaries where oxygen and nutrients are exchanged with tissues.
Blood first leaves the heart of a fish and enters the gills for oxygenation. From the gills, oxygenated blood is transported to the rest of the fish's body through arteries.
Blood enters the nephron first. It enters through the afferent arteriole into the glomerulus, where filtration takes place to form the initial filtrate.
The first section of the nephron tubule into which the filtrate enters is the Bowman's capsule. It is a cup-shaped structure located in the renal cortex that surrounds the glomerulus and receives the initial filtrate from the blood.
after pupil first light enters aqueous humour or pupil
The first leaves are formed by the shoot apical meristem.