For the First Nine Months After Birth,Ronny Knowse Had Not

question 16

Multiple Choice

For the first nine months after birth,Ronny Knowse had not experienced any problems with sickness.After that,however,he had many severe bacterial infections.The reason for the delayed onset of this problem was

• A)it took nine months for the thymus to develop fully.
• B)he probably was not exposed to any antigens during the first nine months.
• C)for the first nine months he had passive natural immunity from antibodies passed to him through the placenta.
• D)he had active artificial immunity during the first nine months.
• E)he had degeneration of his normal immune function after birth.

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Definitions:

Sacrum

A triangular bone at the base of the spine, formed by the fusion of several vertebrae and connecting the spine to the pelvis.

Atlantoaxial Joint

A joint between the first and second cervical vertebrae of the spine, allowing for head rotation.

Neurologist

A Neurologist is a medical doctor specializing in the diagnosis, treatment, and management of disorders related to the nervous system, including brain, spinal cord, and nerves.

Spinal Cord

A long, thin, tubular structure made up of nervous tissue, which extends from the brain, downward through the vertebral column, facilitating communication between the brain and the body.