The given question is incorrect. The correct question is:
Question: When the diaphragm contracts, _______.
A) it lifts the rib cage
B) it rises in the thoracic cavity
C) it flattens out
D) it flattens out and it rises in the thoracic cavity
Answer:
C) it flattens out
Explanation:
The diaphragm is a muscular dome-shaped structure. It contracts and relaxes during inhalation and exhalation respectively. During normal and quiet inhalation, the diaphragm and external intercostal muscles contract. The contraction of the diaphragm makes it flat to increase the volume of the thoracic cavity. This allows the lungs to expand and the pulmonary air pressure is reduced. The atmospheric air moves into the lungs.
The Left kidney (your perspective) is usually higher.
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Answer:
Hello! Here are the answers:
- Chromosomes are a highly condensed form of a combination of DNA and protein called chromatin. DNA strands (negatively charged) are tightly wound around these proteins called histones (positively charged) to form chromosomes.
- Mechanism genes code for for proteins that govern life processes. These genes or portions of DNA are called exons. DNA segments between these exons are called introns that strictly code for regulatory proteins and also contain genetic regulatory elements (DNA sequences that control gene expression).
- Gene expression is the process of translation of DNA sequences into proteins. The genetic code is the nucleotide sequence in the DNA itself that codes for different amino acids that combine together to form a functional protein.
Explanation:
* 2. The intronic regions are misleadingly referred to as "junk DNA" but introns code for crucial regulatory elements that control gene expression.
* 3. The genetic code determines the sequence of amino acids in various proteins.
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