No

Oxygen diffuses from the alveoli into the blood due to higher PO2 (partial pressure of oxygen) levels in the alveoli than in the blood.

Alveoli.

it has many more capillaries...if you were to wrap all of your capillaries around earth it would wrap around twice

The blood pressure in the capillaries at arterial end is about 25 to 30 mm of Mercury. The oncotic pressure of the plasma proteins is about 22 mm of mercury. So there is net force, which drives out the fluid in the interstitial space. The fluid is sucked back at the venous end of the capillaries by the oncotic pressure of the plasma proteins. It should be called as pressure gradient.

Oxygen enter the capillaries by diffusion due to difference in oxygen concentrations.

The capillaries are contained within the dermis and and nutrients that the epidermis requires diffuses up to it.

The 6 amino acid in the hemoglobin beta chain is different than that of a normal hemoglobin protein. This causes the hemoglobin protein to change shape, and if a protein changes shape it also changes function. These proteins have more hydrophobic areas that link together to form chains. It is these chains that causes the blood cell to become sickle in shape. These blood cells are hard and more sharp on these edges, while normal blood cells appear as if they a soft dougnuts. When normal blood cells travel through blood vessels they sometimes bounce off the vessel walls, this is also true for sickle cells but instead of bouncing off they become inbedded in the vessel wall. over time other sickle cells pile up on the original sickle cell eventually blocking the vessel completely.

To prevent back flow of blood as the blood pressure in veins is greatly decreased compared to artieries

It is the heart that pumps fresh oxygen in the blood.

Glomerulus

peritubular capillaries

Capillaries lead to the smallest venules. The capillaries connect arteries and veins.

diapedesis

There are three layers to the walls of an artery or vein. The Tunica Adventitia, the Tunica Media, and the Tunica Intima.

Becouse of its strong dipole and hydrgen bonds. Water has a property of cohesion and adhesion so it sticks to itself yet climbs the tree using adhesion. Although, in the lab water cannot be replicated to climb as high as trees such as redwoods and even smaller trees like pines. The most it can climb in lab is 23ft. It is still a mystery.

The jugular vein in the neck is one of the largest veins in the body that's anywhere near the surface. It can be sewn together again by a doctor, but in terms of first aid it is vital to plug the hole immediately. This overrides the usual concerns about infection and the like, because a person with a severed jugular will bleed out in a matter of moments. Grab anything handy and press it tightly over the wound; the other jugular on the opposite side of the neck can return the blood from the head, so it doesn't matter much if you completely block the vein on the wounded side. Have someone else call 911.

The brain and spinal cord, which can be thought of as an extension of the brain stem have a few protective mechanisms. The first is the cerebral spinal fluid (CSF) which is like a cushion that bathes the brain. Also there ia a blood-brain barrier created by special cells that line the blood cappillaries that protect the delicate brain tissues from red blood cells (RBC) and certain chemicals, viruses, and medications. Then there are the meninges. They are layers of protective tissue that wrap around the brain and spinal cord much like our cloths protect our bodoes, the first layer is called pia mater. It means delicate mother, and you can think of this as silk underwear. After that the next layer is like our regular clothing, called the arachnoid mater, or just arachnoid, referring to its web-like structure, much like our cloths are webbed, or woven. The third layer is more like a leather jacket and leather pants. This is the 'tough mother' or dura mater. And finally, the brain and spinal cord is protected by a skeletal encasement, the brain in the cranium and the spinal cord in the vertebrae. Think of this like safety gear such as elbow and knee pads, shin guards, helmet, boots, wrist guards, and gloves. Such a complex system as the brain and spinal cord needs lots of layers of protection. I hope this created a complete picture for you so you can vizualize the layers surrounding the brain and spinal cord.