What is the main reason blood flow is slowest in the capillaries?

Choice A rationale:

Low blood viscosity is not the primary reason blood constantly circulates. It is the heart that creates the pressure increase in arteries that pushes blood through the body.

Choice B rationale:

Vasoconstriction and dilation are not the primary reasons blood constantly circulates. They are mechanisms that help regulate blood flow and pressure, but the constant circulation of blood is due to the beating of the heart.

Choice C rationale:

Pressure gradients play a role in blood circulation, but they are not the primary reason blood constantly circulates. The heart is the organ that creates the pressure increase in arteries that pushes blood through the body.

Choice D rationale:

The beating of the heart is the primary reason that blood constantly circulates throughout the body.

hoice A rationale:

Peyer’s patches are lymphoid nodules located in the small intestine, not at the back of the throat.

Choice B rationale:

Lymph is a fluid that contains white blood cells and circulates throughout the lymphatic system, not a tissue located at the back of the throat.

Choice C rationale:

Tonsils are lymphoid tissues located at the back of the throat. They help protect the body from respiratory infections.

Choice D rationale:

The appendix is not located at the back of the throat. It is a narrow pouch that projects off the cecum in the digestive system.