Amniotic fluid cushions the fetus, allowing for movement and protecting it from external shocks.

Amniotic fluid surrounds the fetus, providing cushioning and allowing for movement, which is essential for musculoskeletal development.

Bile emulsifies fats, breaking them down into smaller droplets to enhance digestion and absorption.

Fiber aids in digestion by promoting regular bowel movements and preventing constipation.

Surfactant reduces surface tension in the alveoli, preventing their collapse and aiding in gas exchange.

Amniotic fluid cushions the fetus, providing protection and allowing for movement.

The aorta is the main artery that distributes oxygenated blood from the heart to the rest of the body.

Coronary arteries supply blood to the heart muscle itself, ensuring it receives the oxygen and nutrients needed to function.

The liver produces bile, which is essential for the emulsification and digestion of fats.

The pancreas secretes digestive enzymes that help break down carbohydrates, proteins, and fats in the small intestine.

The placenta provides oxygen and nutrients to the developing fetus and removes waste products.

The sinoatrial (SA) node acts as the natural pacemaker of the heart, initiating electrical impulses that trigger heartbeats.

The valves in the heart prevent the backflow of blood, ensuring it flows in one direction.

Villi increase the surface area of the small intestine, enhancing nutrient absorption.

Villi increase the surface area of the small intestine, enhancing nutrient absorption.

Pulmonary circulation is significant as it circulates blood between the heart and lungs for oxygenation.

The sinoatrial (SA) node is known as the heart's natural pacemaker, generating electrical impulses that initiate heartbeats.

The stroke volume of a healthy adult heart is approximately 70 mL per beat.

Systole is the contraction phase of the heart cycle, during which the heart pumps blood.

Neurulation is the process during embryonic development that leads to the formation of the nervous system.

Natural selection is the evolutionary process by which species adapt to their environment, favoring traits that enhance survival and reproduction.

Convergent evolution occurs when unrelated species evolve similar traits due to similar environmental pressures.

Internal respiration refers to the exchange of gases between the blood and the tissues of the body.

The zygote is the initial cell formed when a sperm fertilizes an egg.

Genotype refers to the genetic makeup of an individual, while phenotype refers to the observable traits.

Fertilization is the process where a sperm cell merges with an egg cell to form a zygote.

Fertilization is the process where a sperm cell fuses with an egg cell to form a zygote.

Fertilization is the process where a sperm cell successfully merges with an egg cell.

Natural selection is the process by which organisms that are better adapted to their environment tend to survive and reproduce.

Evolution is the process through which species undergo changes over time due to adaptations to their environment.