How do malaria parasites enter host cells?

How do malaria parasites enter host cells?

• A. By passive diffusion through the cell membrane
• B. Through direct invasion of hepatocytes
• C. By endocytosis via immune cells
• D. By binding to erythrocytes selectively

Answer: (B)

Malaria parasites, specifically Plasmodium species, have a complex life cycle involving multiple stages, and their entry into host cells is a crucial step for their propagation and survival. The correct mechanism of entry for malaria parasites into host cells is through the direct invasion of hepatocytes during their liver stage and later into erythrocytes (red blood cells). When female Anopheles mosquitoes bite humans, they inject sporozoites into the bloodstream. These sporozoites travel to the liver, where they invade hepatocytes through direct interaction with specific receptors on the hepatocyte surface. Following this invasion, the parasites can multiply within the liver cells before being released back into the bloodstream as merozoites. Later, the merozoites target erythrocytes, where they perform a similar process of direct invasion. This selective binding to erythrocytes is a critical step for the asexual reproduction of the parasites and is facilitated by specific ligands and receptors that allow the parasite to effectively attach and enter into red blood cells. This direct invasion is an active process that utilizes proteins from the parasite to interact with host cell components, leading to the incorporation of the parasite into the host cell, unlike other methods such as passive diffusion or endocytosis through

Malaria parasites, specifically Plasmodium species, have a complex life cycle involving multiple stages, and their entry into host cells is a crucial step for their propagation and survival. The correct mechanism of entry for malaria parasites into host cells is through the direct invasion of hepatocytes during their liver stage and later into erythrocytes (red blood cells).

When female Anopheles mosquitoes bite humans, they inject sporozoites into the bloodstream. These sporozoites travel to the liver, where they invade hepatocytes through direct interaction with specific receptors on the hepatocyte surface. Following this invasion, the parasites can multiply within the liver cells before being released back into the bloodstream as merozoites.

Later, the merozoites target erythrocytes, where they perform a similar process of direct invasion. This selective binding to erythrocytes is a critical step for the asexual reproduction of the parasites and is facilitated by specific ligands and receptors that allow the parasite to effectively attach and enter into red blood cells.

This direct invasion is an active process that utilizes proteins from the parasite to interact with host cell components, leading to the incorporation of the parasite into the host cell, unlike other methods such as passive diffusion or endocytosis through