The correct option is B.
The blood brain barrier is designed to prevent the passage of some substances such as drugs from the blood stream into the brain. The blood brain barrier is made up of high density cell barriers which restrict passage of substances into the brain area.
The right answer is D.
The two men (Darwin and Lyell) were very close for several decades, both personally and scientifically. Darwin had read Lyell's Principles of Geology (1830-1833) during his voyage aboard the Beagle (1831-1836), in which he had found an important source of inspiration for developing his theory of natural selection.
Answer:
White blood cells are created in bone marrow
Explanation:
The right atrium receives blood returning from others parts of the body through the superior vena cava and the inferior vena cava.
Explanation:
The pathway of circulation begins in the right atrium which receives the carbon dioxide-rich deoxygenated blood returning through the systemic circulation.
The deoxygenated blood from regions superior to the heart, i.e., the head, neck, shoulder areas are collected through the superior vena cava and that from the parts inferior or lower to the heart like visceral organs, extremities, trunk, hip etc are brought through the inferior vena cava.
Both these venous systems (superior and inferior) fill the right atrium.
The right atrium then pumps the deoxygenated blood to the right ventricle via the tricuspid valve.
The right atrium is filled with blood during diastole.