The correct answer is true
A. The atria are contracting and pushing blood into the bottom ventricles of the heart.
B. The ventricles are contracting and pushing blood out of the heart to the lungs and body.
C. The valves between the atria and ventricles close, producing the second heartbeat.
D. The valves of the aorta and pulmonary artery close, producing the second heartbeat.
Answer: Which statement describes the condition of the heart at the point indicated in the electrocardiogram?
Explanation:
The electrocardiogram is a test that records the electrical activity of the heart. Each beat produces an electrical activity and with an electrocardiograph we can see how that activity is and if there are alterations of the heart rhythm.
The P wave is the first wave of the cardiac cycle. It represents the depolarization of the atria. It is composed of the superposition of the electrical activity of both atria.
Its initial part corresponds to the depolarization of the right atrium and its final part to that of the left atrium.
The following is true when comparing types of painsensations Delta fibers. Thus, option B is correct.
Myelinated fibers may be defied as the fibers that are covered by the myelin sheath. Three different classes of nerve fibers are group A nerve fibers, B fibers and C fibers.
Delta fibers are the type of group A fibers. These fibers are involved in the transmission of the acute pain information. The information is transferred from the sensory fibers to the central nervous system. These delta fibers can carry information faster and they are larger than the C fibers.
The central nervous system (CNS) comprises the brain and spinal cord. It generally contains two types of tissues: white matter and gray matter. White matter appears pinkish white while the gray matter is a darker hue.
Therefore, The following is true when comparing types of painsensations Delta fibers. Thus, option B is correct.
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Hi !
The C group fibers are unmyelinated and have a small diameter and low conduction velocity, whereas Groups A and B are myelinated.