Question

Name the largest:
(a) Artery
(b) Vein in our body.

Answer 1

Hint: Most arteries and veins present in our body that carries blood far away from your heart to the remainder of your body and from rest body parts to the heart respectively.

Complete answer:
The largest artery within the body is the aorta, which is connected to the guts and extends down into the abdomen. The aorta has high-pressure, oxygenated blood pumped directly into it from the ventricle of the heart. The aorta has many branches, and therefore the branches subdivide repeatedly, with the subdivisions growing smaller and smaller in diameter. The littlest arteries are called arterioles.
The largest veins within the body are veins (Inferior/Superior). The superior vein, which carries blood from the upper body on to the right atrium of the heart, and the inferior vein, which carries blood from the lower body on to the right atrium. Like arteries, veins form a posh, branching system of larger and smaller vessels. The littlest veins are called venules. They get blood from capillaries and convey it to bigger veins. Each venue receives blood from multiple capillaries.

Additional information:
Arteries are defined as blood vessels that carry blood far away from the heart. Blood flows through arteries largely because it's struggling from the pumping action of the heart. It should be noted that coronary arteries, which supply cardiac muscle cells with blood, travel toward the heart but not as a part of the blood flow that travels through the chambers of the heart. Most arteries, including coronary arteries, carry oxygenated blood, but there are a couple of exceptions, most notably the pulmonary artery. This artery transports deoxygenated blood from the heart towards the lungs, where it takes oxygen and releases carbon dioxide. In virtually all other arteries, the hemoglobin in red blood cells is very saturated with oxygen (95-100 percent). These arteries dispense oxygenated blood to tissues all over the body.
Veins are known as blood vessels that transport blood to the heart. Blood traveling through veins isn't struggling from the beating heart. It gets help moving along by the squeezing action of skeletal muscles, for instance, once you walk or breathe. It’s also prevented from flowing backward by valves within the larger veins, as illustrated within the following figure. Veins are known as capacitance blood vessels as the bulk (around 60 percent) of the body’s entire volume of blood is contained inside the veins.

So, the largest artery is the aorta and Veins are vena cava in our body.

Note:
The walls of both arteries and veins have three layers which are the tunica intima, tunica media, and tunica adventitia. Tunica intima is the most inside layer of the arteries and veins. The tunica media is the middlemost layer of arteries and veins. The tunica adventitia is the outer layer of arteries and veins.