Answer: 1. Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
2. Plasma is the main component of blood and consists mostly of water, with proteins, ions, nutrients, and wastes mixed in. Red blood cells are responsible for carrying oxygen and carbon dioxide. Platelets are responsible for blood clotting. White blood cells are part of the immune system and function in immune response.
3.Within the bone marrow, all blood cells originate from a single type of unspecialized cell called a stem cell. When a stem cell divides, it first becomes an immature red blood cell, white blood cell, or platelet-producing cell.
4. Epinephrine and norepinephrine, hormones secreted by the adrenal medulla, raise blood pressure by increasing heart rate and the contractility of the heart muscles and by causing vasoconstriction of arteries and veins. These hormones are secreted as part of the fight‐or‐flight response.
U.S. Department of Agriculture
and U.S. Department of Health and Human Services
Help control blood sugar levels
Answer:
The lungs are not equal in size. The right lung is shorter, because the liver sits high, tucked under the rib cage, but it is broader/wider than the left. Each lung is separated into lobes branching off the main bronchus the right lung has three lobes, while the left has only two lobes. That's why the left lung and the right lung are difference.
Explanation:
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Answer:
Ureter
Explanation:
Ureter -
Ureter is a narrow tubes which carry urine from the kidneys to the bladder .
The muscles in the ureter walls relax and tighten in order to force the urine downwards , out of the kidneys .
Hence ,
The ureters are responsible to conduct the newly formed urine , that is produced in the renal pelvis to the urinary bladder .