General Human Anatomy Trivia Quiz

Answer: stapedius (muscle found in the middle ear)

The stapedius muscle is a small muscle attached to stapes (a bone found within the middle ear). Stapedius was categorized to be a skeletal muscle because it is striated and is found attached to a bone. Despite its classification as a skeletal muscle, it moves involuntarily.

It only contracts when there is too much vibration by the ossicles (bones of the ear) caused by a very loud sound. It functions to dampen or lessen the volume of the sound so that the inner ear would not get destroyed.

Answer: 9th rib

Ribs 1 to 7 are considered to be true ribs because they are vertebrosternal (attached to the back bone and breast bone). Ribs 8 to 10 are considered to be false ribs because they are vertebrochondral (attached to the back bone and the cartilage of the 7th rib). Meanwhile, ribs 11 and 12 are floating ribs because they are only attached to the back bone.

Answer: The mass is attached to the thyroid cartilage

When a person swallows, the larynx moves upward. This is one way to ensure that food would go the esophagus rather than to the trachea (wind pipe). A structure found in front of the larynx is the thyroid cartilage where the thyroid gland is attached below.

It can be concluded from the given scenario that the mass could be an enlargement of the thyroid gland since it moved together with the thyroid cartilage which is attached to the larynx.

Answer: The skin has three layers: epidermis, dermis, hypodermis

Hypodermis is not anymore considered as a layer of the skin. The skin principally has only two layers: the epidermis found outside and the dermis found inside.

Answer: SVC and IVC --> RA --> RV --> pulmonary artery --> pulmonary vein --> LA --> LV --> aorta

Blood enters the heart through the great veins, superior and inferior vena cava. The first chamber of the heart to be filled with venous blood is the right atrium. When the tricuspid valve opens, the right atrium empties blood to the right ventricle. After the filling of blood in the right ventricle, the tricuspid valve closes.

The high pressure due to the myocardial contraction of the right ventricle opens the pulmonary valve. Blood from the right ventricle goes into the pulmonary arteries. The pulmonary arteries carry blood into the lungs where gas exchange occurs. Oxygenated blood enters the heart via the pulmonary veins into the left atrium.

When the mitral valve opens, the left atrium empties blood into the left ventricle. After the filling of blood in left ventricle, the mitral valve closes.

The high pressure due to the contraction of the left ventricle opens the aortic valve. Blood from the left ventricle goes into the aorta and is distributed to the different parts of the body.

Answer: The right kidney is lower compared to the left kidney

The right kidney is lower than the left kidney because the liver is found superior (above) the right kidney. Since the liver is a big organ, the kidney descended a little to give way for the liver's size. The kidneys are not found within the peritoneum (covering of the abdominal wall). Rather, the kidneys are found retroperitoneally (behind the peritoneum).

The kidneys are not found at the anterior (front) abdominal wall. Instead, they are found at the posterior (back) abdominal wall.

Answer: left common carotid artery

The left common carotid artery is a branch of the arch of the aorta. The arch of the aorta is found immediately after the aorta leaves the heart, where it forms an arch at the level between T4 and T5 vertebrae. Meanwhile, the celiac, superior mesenteric, and inferior mesenteric arteries are branches of the abdominal aorta supplying the foregut, midgut, and hindgut.

Answer: subarachnoid space

The subarachnoid space is the space below the arachnoid mater (between arachnoid mater and pia mater). This space is filled up with cerebrospinal fluid or CSF. The CSF functions to remove metabolic wastes from the central nervous system since it drains to the venous circulation, and it also contributes to protect the brain and spinal cord against any mechanical injuries from the outside.

Answer: fovea centralis

The fovea centralis is a depression within the area called the macula densa. Fovea centralis contains cones (receptor for light during daytime). This is where vision is at its sharpest. The optic disc is an area within the retina where the ganglia converge to become the optic nerve, therefore this is the blind spot of the retina since no sensory activity is observed in this area.

The choroid is the pigmented and highly vascular (rich in blood vessels) layer of the eye that supplies nutrients for the retina. Cornea is the anterior (front) 1/5 of the fibrous coat of the eye that acts as a refractive medium during the entrance of light rays into the eye.

Answer: corpus spongiosum

Corpora cavernosa are filled with small sinuses that gets filled up with blood during erection, thus the mass and volume of the penis increases. The ischiocavernous muscle also helps in the erection by keeping the penis in an upright position. The corpus spongiosum runs ventrally (at the lower border) of the penis.

It contains the penile urethra, the passageway for urine and seminal fluid. At its tip is the glans penis or the head of the penis where the urethral orifice (opening) is found. The corpus spongiosum do not contribute to the penile erection. Rather, it prevents the compression of the penile urethra running within it during penile erection.