Which anatomical structure houses the malleus, incus, and stapes?

 

The urethra is the tube that transports both semen and urine out of the body through the penis. It is part of both the male reproductive system and the urinary system.

Choice A is wrong because the epididymis is a coiled tube that stores and transports sperm from the testes to the vas deferens.

It is only part of the male reproductive system.

Choice C is wrong because the testes are the male gonads that produce sperm and testosterone.

They are also only part of the male reproductive system.

Choice D is wrong because the ureter is a tube that carries urine from the kidney to the bladder.

It is only part of the urinary system.

Red bone marrow is the site of blood production in infants after birth. Red bone marrow is found in the spongy tissue of some bones, such as the sternum, ribs, pelvis, and vertebrae.

Choice B is wrong because red pulp in the spleen is involved in filtering and recycling old red blood cells, not producing new ones.

Choice C is wrong because the heart is not a site of blood production, but a pump that circulates blood throughout the body.

Choice D is wrong because sinusoids of the liver are enlarged capillaries that allow blood to flow from the portal vein to the hepatic vein. They are not involved in blood production

This muscle is one of the four muscles that make up the quadriceps femoris group and it lies on the lateral side of the thigh. It originates from the greater trochanter and lateral lip of the linea aspera of the femur and inserts into the patella and tibial tuberosity via the quadriceps tendon. It acts to extend the knee and stabilize the patella.

Choice A. Gastrocnemius is wrong because this muscle is not part of the quadriceps femoris group. It is located in the posterior compartment of the leg and it acts to flex the knee and plantarflex the ankle.

Choice C. Anterior tibialis is wrong because this muscle is not part of the quadriceps femoris group. It is located in the anterior compartment of the leg and it acts to dorsiflex and invert the foot.

Choice D. Rectus femoris is wrong because this muscle does not lie on the side surface of the lower extremity.

It is part of the quadriceps femoris group and it lies on the anterior surface of the thigh. It originates from the anterior inferior iliac spine and acetabular rim of the pelvis and inserts into the patella and tibial tuberosity via the quadriceps tendon. It acts to extend the knee and flex the hip.

The correct answer is choice B. Endocrine glands secrete chemicals into the blood. This is because endocrine glands are ductless glands that release their products (hormones) directly into the bloodstream, where they can reach their target cells throughout the body.

Choice A is wrong because salivary glands are exocrine glands, not endocrine glands. Exocrine glands secrete their products into ducts that lead to an internal or external surface.

Choice C is wrong because it describes exocrine glands, not endocrine glands. Exocrine glands release their secretions on an internal or external surface via ducts.

Choice D is wrong because it also describes exocrine glands, not endocrine glands. Endocrine glands do not secrete their products into ducts, but directly into the blood.