Multicellular organisms<span> can be much larger and more complex. This is because the cells of the </span>organism<span> have specialised into many </span>differenttypes of cells such as nerve cells, blood cells, muscle cells all performingdifferent<span> functions.</span>
Acetylcholine helps _initiate_ muscle contraction in the peripheral nervous system (pns), whereas it acts to _inhibit_ muscle contraction in the central nervous system (cns).
The answer is -12
Starting with a base of 0 cheetahs:
- 5 are born (0+5=5)
- 15 die (5-15=-10)
- 2 come (-10+2=-8)
- 4 leave (-8-4=-12)
After everything happens, the cheetah population has overall lost 12 cheetahs.
The Human Immunodeficiency Virus (HIV) has been discovered to be the cause of AIDS.
AIDS or Acquired Immunodeficiency Syndrome is caused by the Human Immunodeficiency Virus (HIV). HIV is a retrovirus which contains RNA as the genetic material.
HIV infection can be transmitted through:-
- sexual contact with an infected individual,
- transfusion of contaminated blood samples,
- sharing infected needles e.g. in the case of drug addicts who take the drug intravenously,
- infected pregnant woman to the fetus through placenta.
AIDS adversely affects the immune system of an infected individual. ELISA or enzyme linked immunosorbent assay test is used largely for diagnosing AIDS.
To learn more about AIDS here
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The specialized organ that provides nourishment and filters away waste products from the developing baby is called the placenta.
<span>The placenta is a multifunctional organ that develops during the pregnancy. It connects the developing fetus to the uterine wall and it functions are to allow nutrient uptake, thermo-regulation, production of hormones waste elimination, protection (fight against infection) and gas exchange via the mother's blood supply. <span>The fetus's umbilical cord develops from the placenta.</span></span>
