Which organ system does not excrete waste?
The cardiovascular system
The respiratory system
The digestive system
The integumentary system
The urinary system
The Correct Answer is A
A. The cardiovascular system is primarily involved in transporting blood and nutrients but does not directly excrete waste.
B. The respiratory system: The respiratory system helps excrete carbon dioxide, a waste product of metabolism.
C. The digestive system excretes waste through the process of defecation.
D. The integumentary system (skin) excretes waste through sweat.
E. The urinary system is directly involved in the excretion of waste products through urine.
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Correct Answer is C
Explanation
A. The neural tube and yolk sac have formed: By 8 weeks, the neural tube and yolk sac have formed, but this is not the criterion for defining a fetus.
B. The amniotic cavity has formed: The formation of the amniotic cavity occurs earlier in development and is not the defining feature of a fetus.
C. All of the organ systems are present: By the end of 8 weeks, the basic structures of all major organ systems are present, which is why the embryo is referred to as a fetus from this point onwards.
D. The mesoderm has formed: The formation of the mesoderm occurs earlier and is not the defining factor for fetal status. By 8 weeks, more significant development, including the presence of organ systems, has occurred.
Correct Answer is A
Explanation
A. Y chromosome: The SRY gene on the Y chromosome codes for the testis-determining factor (TDF), which initiates the development of testes and male characteristics.
B. Gonadal ridges: The gonadal ridges are the precursor structures that develop into gonads but do not contain the gene for TDF.
C. X chromosome: The X chromosome contains genes important for development but does not code for TDF.
D. Fetal testes: The fetal testes produce testosterone but are not the source of the TDF gene.