Relating to the Fetal Circulatory System,which Special Characteristics Allow the Fetus

question 16

Multiple Choice

Relating to the fetal circulatory system,which special characteristics allow the fetus to obtain enough oxygen from the maternal blood? (Select all that apply. )

• A) Fetal hemoglobin (Hb)carries 20% to 30% more oxygen than maternal Hb.
• B) Fetal Hb carries 40% to 50% more oxygen than maternal Hb.
• C) Hb concentration is 50% higher than that of the mother.
• D) Fetal heart rate is 110 to 160 beats per minute.
• E) Fetal heart rate is 160 to 200 beats per minute.

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Definitions:

Hox Genes

A group of related genes that control the body plan of an embryo along the head-tail axis by specifying regions of identity.

Ectodermal Tissue

One of the three primary germ layers in the embryo of a multicellular organism, which gives rise to the skin and nervous system.

Body Wall

The outermost layer of an organism's body, protecting internal organs and systems from external threats or injuries.

Gut Formation

The developmental process during which the digestive system is formed in an embryo, a critical aspect of animal development and physiology.