Which of the following blood vessels carry blood containing excretory substances into the kidney ?

The correct option is A

Renal artery

The correct option is A.

Explanation of the correct option:

1. Renal artery carries the blood from the heart to the kidneys.
2. This blood is then purified by the kidneys to make it free from the metabolic wastes and other toxins.

Explanation of the incorrect option:

Option B:

1. The blood which is purified by the kidney is sent back to the heart.
2. Renal vein carries the blood from the kidney towards the heart.

Option C:

1. Renal capillaries deliver wastes to be secreted into urine
2. They also reabsorb nutrients from the filtrate that your body needs.

Final answer: Blood vessels that carry blood containing excretory substances into the kidney is renal artery.