Answer:
The efficiency of the cardiovascular system
Explanation:
Cardiovascular endurance is how efficiently your heart, blood vessels, and lungs to supply oxygen rich blood to working muscles during physical activity (aerobic activity like walking, running, cycling or playing a sport) for a prolonged period of time or for more than 90 seconds.
When a sperm and an egg are combined they create a zygote.
Answer:
decide to come out
Explanation:
nobody should keep anything in for one its <u>unhealthy</u> two its dumb three why whats point
Answer:
B
Explanation:
Abstinence. This means no sexual intercourse at all. And without sexual intercourse, pregnancy cannot occur.
<h3><u>Answers;</u></h3>
-less than 1%
-Thrombopoiesis
-Megakaryoblast
-Thrombopoietin
-Megakaryocyte
-Proplatelets
-Platelets (thrombocytes)
<h3><u>Explanation</u>;</h3>
- Platelets (or thrombocytes) make up less than 1% of formed elements with a concentration between 150,000 and 400,000 per cubic millimeter. The production of platelets is called thrombopoiesis.
- From the myeloid stem cell, a committed cell called a megakaryoblast is produced. It matures under the influence of thrombopoietin to form a megakaryocyte.
- Megakaryocytes are easily distinguished both by their large size (about 100 micrometers [μm] in diameter) and their dense, multilobed nucleus. Each megakaryocyte then produces thousands of platelets.
- The process of how megakaryoctes produce thrombocytes was in question until 2007. Researchers reported that megakaryoctes produce long extension from themselves called proplatelets.
- While still attached to the megakaryoctye, these proplatelets extreough the blood vessel wall in the red bone marrow. The force from the blood flow "slices" these proplatelets into the fragments we know as platelets (thrombocytes).
