The primary function of melanin in the skin is to provide protection against ultraviolet radiation.
Correct Answer
True
Melanin absorbs and disperses ultraviolet light, protecting DNA in skin cells from damage.
Question 2
The axial skeleton includes the skull, vertebral column, and rib cage, providing protection for vital organs.
Correct Answer
True
The axial skeleton is composed of the bones along the central axis of the body, which include the skull, vertebral column, and thoracic cage, all serving protective roles.
Question 3
Tendons connect muscle to bone, transmitting the force of muscle contraction to move the skeleton.
Correct Answer
True
Tendons are strong connective tissues that attach skeletal muscles to bones, enabling movement when muscles contract.
Question 4
The cerebrum is primarily responsible for higher-level cognitive functions like memory, language, and voluntary movement.
Correct Answer
True
The cerebrum is the largest part of the brain and is responsible for complex functions such as thought, voluntary action, perception, and language.
Question 5
The pituitary gland, often called the "master gland," controls the activity of many other endocrine glands.
Correct Answer
True
The pituitary gland secretes hormones that regulate the function of various other endocrine glands, including the thyroid, adrenal glands, and gonads.
Question 6
The left ventricle pumps oxygenated blood to the systemic circulation through the aorta.
Correct Answer
True
The left ventricle has thick muscular walls that contract powerfully to eject oxygenated blood into the aorta for distribution to the entire body.
Question 7
Lymph nodes filter lymph and house lymphocytes and macrophages to remove pathogens and debris.
Correct Answer
True
Lymph nodes are critical components of the immune system, serving as sites where immune cells monitor and filter lymph for foreign substances.
Question 8
Gas exchange in the lungs occurs primarily in the alveoli, which are tiny air sacs with thin walls adapted for diffusion.
Correct Answer
True
The thin, moist walls of the alveoli provide a large surface area for the efficient diffusion of oxygen into the blood and carbon dioxide out of the blood.
Question 9
The liver produces bile, which aids in the emulsification of fats in the small intestine.
Correct Answer
True
Bile is produced by the liver and stored in the gallbladder, then released into the small intestine to break down large fat globules into smaller ones, facilitating digestion.
Question 10
The renal cortex contains the glomeruli and Bowman's capsules, which are key structures for blood filtration.
Correct Answer
True
The renal cortex is the outer region of the kidney where the initial filtration of blood occurs in structures like the glomeruli and Bowman's capsules.
Question 11
The ovaries produce ova and female hormones such as estrogen and progesterone.
Correct Answer
True
The ovaries are the primary female reproductive organs, responsible for both gamete (ova) production and the secretion of key sex hormones.
Question 12
Sudoriferous glands are responsible for producing sebum to lubricate skin and hair.
Correct Answer
False
Sebaceous glands produce sebum to lubricate skin and hair. Sudoriferous glands, also known as sweat glands, produce sweat for thermoregulation.
Question 13
Osteoblasts are bone-resorbing cells that break down bone matrix.
Correct Answer
False
Osteoclasts are the cells responsible for bone resorption and breaking down bone matrix. Osteoblasts are cells that build new bone tissue.
Question 14
Cardiac muscle is found in the walls of the heart and is under voluntary control, allowing precise regulation of heart rate.
Correct Answer
False
Cardiac muscle is indeed found in the heart walls, but it is under involuntary control, meaning its contractions are regulated by the autonomic nervous system and not conscious thought.
Question 15
Myelin sheaths surrounding axons in the peripheral nervous system are formed by oligodendrocytes.
Correct Answer
False
Myelin sheaths in the peripheral nervous system are formed by Schwann cells. Oligodendrocytes form myelin sheaths in the central nervous system.
Question 16
The adrenal cortex secretes epinephrine and norepinephrine, which are involved in the "fight or flight" response.
Correct Answer
False
The adrenal medulla secretes epinephrine and norepinephrine. The adrenal cortex produces steroid hormones such as cortisol and aldosterone.
Question 17
Arteries always carry oxygenated blood away from the heart.
Correct Answer
False
Arteries carry blood away from the heart. However, pulmonary arteries carry deoxygenated blood from the heart to the lungs.
Question 18
The spleen's primary role is to produce all types of blood cells throughout an individual's adult life.
Correct Answer
False
In adults, the spleen primarily filters blood, removes old red blood cells, and stores platelets. Most blood cell production (hematopoiesis) occurs in the red bone marrow.
Question 19
The epiglottis prevents food and liquid from entering the esophagus during swallowing.
Correct Answer
False
The epiglottis is a flap of cartilage that covers the opening of the trachea (windpipe) during swallowing, preventing food and liquid from entering the respiratory tract.
Question 20
The small intestine is the primary site for water reabsorption and compaction of indigestible material into feces.
Correct Answer
False
The large intestine is the primary site for water reabsorption and compaction of indigestible material into feces. The small intestine is primarily responsible for nutrient absorption.
Question 21
The urethra transports urine from the kidneys to the urinary bladder.
Correct Answer
False
The ureters transport urine from the kidneys to the urinary bladder. The urethra transports urine from the urinary bladder to the outside of the body.
Question 22
Spermatogenesis occurs in the epididymis, where sperm mature and are stored.
Correct Answer
False
Spermatogenesis, the process of sperm production, occurs in the seminiferous tubules within the testes. The epididymis is where sperm mature and are stored.