The given question is incorrect. The correct question is:
Question: The thoracic cavity contains the ________. it is found ________ to the vertebral cavity.
a) digestive viscera: inferior
b) kidneys and spleen: deep
c) stomach and liver: superficial
d) heart and lungs: anterior
Answer:
d) heart and lungs: anterior
Explanation:
The thoracic cavity is one of the major body cavities. The thoracic cavity is also called the chest cavity. It is formed by the ribs, the chest muscles, the sternum (breastbone), and the thoracic portion of the vertebral column. It is present in the anterior to the cavity formed by the spine to house the spinal cord. The pericardial cavity is the fluid-filled space of the thoracic cavity present around the heart. The thoracic cavity also has two pleural cavities to house the lungs.
Answer:
What ar the answer choices?
Explanation:
Nucleotides - they are molecules present in cells and are formed by nitrogenous bases
In aquatic plants, water passes among the tissues and provides the medium for gas exchange. In terrestrial plants, air enters the tissues, and the gases diffuse into the moisture bathing the internal cells.
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Answer:
Sternocleidomastoid, pectoralis minor, scalenes
Explanation:
During normal inhalation, contraction of the diaphragm and the contraction of external intercostals expands the chest cavity. The increased volume of the thoracic cavity results in reduced alveolar pressure than the atmospheric pressure to facilitate the flow of air into the lungs in response to the pressure gradient.
During deep inhalation as it occurs when running up the stairs, the accessory muscles of inhalation also participate to increase the volume of the chest cavity. The contraction of scalene and sternocleidomastoid muscles increase the volume of the chest cavity further to create a greater drop in alveolar pressure.
During forceful inhalation, the sternocleidomastoid muscles serve to elevate the sternum, the scalene muscles serve to elevate the first two ribs while the pectoralis minor elevate the third through fifth ribs.
