PENN FOSTER INTRO TO BIOLOGY
PROCTORED PRACTICE SOLUTION 2026
QUESTIONS WITH ANSWERS GRADED A+
⩥ Lymphatic Capillaries. Answer: Present in almost every body tissue
but absent in places such as bone marrow and central nervous system;
lead to larger lymph vessels that ultimately dump recovered fluid back
into circulatory system at the base of the neck; filter foreign material
(including microorganisms)
⩥ Lymphocytes. Answer: Help identify and remove microorganisms
from the body; white blood cells that recognize various antigens
⩥ Spleen. Answer: Largest lymphatic organ; filters blood rather than
lymph; has a store of blood cells and replaces damaged blood cells that
pass through it
⩥ Communicable Diseases. Answer: Diseases that are caused by
pathogens; can be transmitted from one person to another
⩥ Viruses. Answer: Microscopic ones are not alive, can invade host cells
to replicate; can cause illnesses ranging in severity (cold, stomach flu,
HIV/AIDS, hepatitis C)
, ⩥ Bacteria. Answer: Trillions of beneficial _____ live in the human
body which help to digest food/keep people healthy; some pathogens
which disrupt normal functioning (strep throat, meningitis, food
poisoning)
⩥ Fungi. Answer: Yeast, mold, mushrooms all eukaryotes; make harder
to treat with meds without affecting human cells (ringworm,
histoplasmosis, yeast infections)
⩥ Parasites. Answer: Inhabit a host + feed on host/host consumes
(plasmodium, tapeworms, ticks)
⩥ Pathogens. Answer: Disrupt human body functions, sometimes by
killing cells, stealing necessary nutrients, or blocking blood flow
⩥ Zoonoses. Answer: Diseases that are spread from vertebrate animals
to humans (rabies, Ebola, bird flu)
⩥ Nonspecific Defenses. Answer: Inflammatory response, fevers, and
interferons; many different pathogens can trigger these responses
⩥ Major Histocompatibility Complex (MHC). Answer: These
glycoproteins are on the surface of nearly every cell in your body and
are unique for each individual, allowing immune system to determine
whether the cell is foreign or not
PROCTORED PRACTICE SOLUTION 2026
QUESTIONS WITH ANSWERS GRADED A+
⩥ Lymphatic Capillaries. Answer: Present in almost every body tissue
but absent in places such as bone marrow and central nervous system;
lead to larger lymph vessels that ultimately dump recovered fluid back
into circulatory system at the base of the neck; filter foreign material
(including microorganisms)
⩥ Lymphocytes. Answer: Help identify and remove microorganisms
from the body; white blood cells that recognize various antigens
⩥ Spleen. Answer: Largest lymphatic organ; filters blood rather than
lymph; has a store of blood cells and replaces damaged blood cells that
pass through it
⩥ Communicable Diseases. Answer: Diseases that are caused by
pathogens; can be transmitted from one person to another
⩥ Viruses. Answer: Microscopic ones are not alive, can invade host cells
to replicate; can cause illnesses ranging in severity (cold, stomach flu,
HIV/AIDS, hepatitis C)
, ⩥ Bacteria. Answer: Trillions of beneficial _____ live in the human
body which help to digest food/keep people healthy; some pathogens
which disrupt normal functioning (strep throat, meningitis, food
poisoning)
⩥ Fungi. Answer: Yeast, mold, mushrooms all eukaryotes; make harder
to treat with meds without affecting human cells (ringworm,
histoplasmosis, yeast infections)
⩥ Parasites. Answer: Inhabit a host + feed on host/host consumes
(plasmodium, tapeworms, ticks)
⩥ Pathogens. Answer: Disrupt human body functions, sometimes by
killing cells, stealing necessary nutrients, or blocking blood flow
⩥ Zoonoses. Answer: Diseases that are spread from vertebrate animals
to humans (rabies, Ebola, bird flu)
⩥ Nonspecific Defenses. Answer: Inflammatory response, fevers, and
interferons; many different pathogens can trigger these responses
⩥ Major Histocompatibility Complex (MHC). Answer: These
glycoproteins are on the surface of nearly every cell in your body and
are unique for each individual, allowing immune system to determine
whether the cell is foreign or not
