Larger
During the process of breathing, the diaphragm contract by moving
downward and upward and this process usually increase or decrease the space in
the chest cavity. However, intercostal muscles between the ribs also help to enlarge
the chest cavity or reduce the space in the chest cavity.
Answer:
The correct answer would be A) ribosomes.
A ribosome is a vesicular structure present in both prokaryotic and eukaryotic cells. They consist of ribosomal RNA and associated proteins.
They are the site of translation in both prokaryotic and eukaryotic cells.
They are made up two units which are called large sub-unit and small sub-unit.
In prokaryotic cells, 70S ribosomes are present which are made up of 50S large sub-units and 30S small sub-units.
In eukaryotic cells, 80S ribosomes are present which are made up of 60S large sub-units and 40S small sun-units.
Answer: Option D: Neuromuscular junction
Explanation:
This is the site of transmission of chemical signal also known as a chemical synapse between a neuron and a muscle fibre. Most of the time the chemical released which is a neurotransmitter is acetylcholine. When released, it stimulates the release of calcuim ions present in the sarcoplasm: an endoplasm like structure in the muscle fiber that contains calcium ions.
<u>Answer:</u>
<em>Paul Ehrlich brought to focus the problem of environmental Pollution and the Climate change, the argument that is responsible for the world’s environmental problems.</em>
<u>Explanation:</u>
<em>Paul Ehrlich</em> stated that we are unprepared to face the effects of the environmental problems. The environmental problem has arisen due to the over consumption of the<em> resources according to Ehrlich. </em>
According to him we have already released enough <em>amount of poisonous substances</em> in the environment which affects our human tissue in a bad way. Ehrlich states that fate of humanity is going to collapse if the activities of <em>exploitation of environment</em> is left unchecked.
