Answer:
True
Explanation:
With the increase in altitude, the atmospheric pressure and amount of oxygen decreases.
When a person moves to high altitude, they adapt to the lack of oxygen by increasing their red blood count and the process is called acclimatization. The lack of oxygen is monitored by the peripheral chemoreceptors, that increases ventilation. The body starts producing red blood cells (RBC) in order to resist the lower oxygen saturation in blood in high altitudes.
That is why, people living in high altitudes have higher red blood cells count in comparison to people living in cities or plain areas.
Hence, the given statement is true.
Answer:A. The release of calcium ions causes myosin and actin to attach to each other.
The contraction of skeletal muscles takes place by induction of a nerve impulse, which produces a movement and the interaction of the filaments containing proteins named as actin and myosin. This interaction of filaments is regulated by proteins called tropomyosin and troponin present on the actin filaments. The motor nerve causes the depolarization of the muscle membrane sarcolemma. This triggers the sarcoplasmic reticulum to release calcium ions. This calcium binds to troponin and thus allows the tropomyosine strand on the actin filament to displace so that the part of the actin where myosine head needs to be attached remain uncovered. Binding of the actin myosine filament results in contraction.
Hence, the release of calcium ions causes myosin and actin to attach to each other causes muscle contraction.
Sexual reproduction in important for human race to survive, ultimately making it essential for every individual.
Carbon is harmful to the earth, as known. And when it reaches water it’ll effect humans in many ways, it’ll usually make the water more acidic! And for us humans it’s harder to filter the water.
