B. Antibiotics attack only bacteria.
If the blood vessels are replaced with collagen connective tissue, they will no longer be elastic and become hard, so the vessels will lose their ability to stretch. This hampers performance.
What is the difference between connective tissue, collagen fibers, and elastic fibers?
- Collagen fibers are the strongest and most abundant of all connective tissue fibers. These are fibrous proteins and are secreted into the extracellular space and they provide high tensile strength to the matrix.
- Elastic fibers are long and thin fibers that form a branching network in the extracellular matrix. They help the connective tissue to stretch and recoil.
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Cardiovascular features unique to the Fetus:
Fetal circulation is characterized by low systemic vascular resistance (SVR) with high systemic blood flow and high pulmonary vascular resistance with low pulmonary blood flow.
<h3>What is fetal circulation?</h3>
The embryonic circulatory system directs blood that needs oxygen through three shunts, or microscopic tunnels. These shunts are intended to avoid forming organs like the liver and lungs while the fetus is still in the womb.
The foramen ovale, which carries blood from the right atrium of the heart to the left atrium, and the ductus arteriosus, which takes blood from the pulmonary artery to the aorta, are the two shunts that bypass the lungs.
Through the placenta, the mother's blood supplies the fetus with nutrition and oxygen. The enhanced blood divides into three branches as it travels via the umbilical cord to the liver.
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