Which chromosomal abnormality is often characteristic of infantile ALL?

Correct Answer: A

Rationale: The t(4;11) translocation is commonly found in infantile ALL and is associated with a poor prognosis.

Correct Answer: A

Rationale: The sympathetic nervous system is responsible for our "fight or flight" response to stressful situations. Norepinephrine is the primary neurotransmitter that mediates the sympathetic response, acting on adrenergic receptors in various target tissues. It helps to increase heart rate, elevate blood pressure, dilate air passages in the lungs, and mobilize energy stores in the body to prepare for physical exertion or stress. Acetylcholine is another neurotransmitter involved in the sympathetic nervous system, but norepinephrine is the primary mediator of the fight or flight response.

Correct Answer: C

Rationale: Digitalis is used for chronic heart failure and certain arrhythmias, but not during acute resuscitation efforts.

Correct Answer: C

Rationale: When introducing solid foods to an infant for the first time, rice cereal is generally recommended as it is mild, easy to digest, and less likely to cause food allergies compared to other foods. It is a good source of iron and a suitable first food for most infants. Introducing rice cereal as the first solid food also helps the baby get accustomed to a different texture and aids in their transition from a milk-only diet to solid foods. It is important to follow the guidance of healthcare professionals regarding the introduction of solid foods to infants to ensure they receive appropriate nutrition and avoid any potential digestive issues.

Correct Answer: D

Rationale: Autistic spectrum disorder includes stereotyped movements, not their absence. Defective social communication, fixated interests, and restricted routines are hallmark features.