The axial skeleton includes the skull, vertebral column, and thoracic cage.
Correct Answer
True
The axial skeleton is comprised of the skull, vertebral column, and the thoracic cage (ribs and sternum).
Question 2
Osteoclasts are responsible for breaking down bone tissue, a process called resorption.
Correct Answer
True
Osteoclasts are specialized cells that dissolve bone mineral and organic matrix during bone resorption.
Question 3
Long bones are characterized by a shaft (diaphysis) and two expanded ends (epiphyses).
Correct Answer
True
This describes the characteristic gross anatomy of a long bone.
Question 4
The epiphyseal plate is a layer of hyaline cartilage that allows for longitudinal bone growth during childhood and adolescence.
Correct Answer
True
The epiphyseal plate is a crucial site of cartilage proliferation and ossification, leading to the lengthening of long bones.
Question 5
Smooth muscle is primarily found in the walls of hollow organs and is under involuntary control.
Correct Answer
True
Smooth muscle contraction is not consciously controlled and is vital for functions like digestion and blood pressure regulation.
Question 6
Ligaments connect bones to other bones, providing stability to joints.
Correct Answer
True
Ligaments are fibrous connective tissues that connect bones, reinforcing and stabilizing articulations.
Question 7
During muscle contraction, the sarcomere shortens as actin and myosin filaments themselves shorten.
Correct Answer
False
During muscle contraction, the sarcomere shortens because actin and myosin filaments slide past each other, not because the filaments themselves shorten. This is the sliding filament model.
Question 8
Skeletal muscle cells are typically multinucleated and possess striations.
Correct Answer
True
Skeletal muscle fibers are large, elongated cells with multiple nuclei and a distinct banded appearance due to the arrangement of myofibrils.
Question 9
The central nervous system (CNS) consists of the brain and spinal nerves.
Correct Answer
False
The central nervous system (CNS) consists of the brain and the spinal cord. Spinal nerves are components of the peripheral nervous system (PNS).
Question 10
Myelin sheaths 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 11
The cerebellum is primarily responsible for higher-order cognitive functions like memory and decision-making.
Correct Answer
False
The cerebrum is primarily responsible for higher-order cognitive functions. The cerebellum's main roles include coordinating voluntary movements, balance, and posture.
Question 12
Neurotransmitters are chemical messengers that transmit signals across a synaptic cleft from one neuron to another.
Correct Answer
True
Neurotransmitters are released from the presynaptic neuron and bind to receptors on the postsynaptic neuron, propagating the nerve impulse.
Question 13
The bicuspid valve, also known as the mitral valve, is located between the right atrium and right ventricle.
Correct Answer
False
The bicuspid (mitral) valve is located between the left atrium and left ventricle. The tricuspid valve is located between the right atrium and right ventricle.
Question 14
The sinoatrial (SA) node is often referred to as the pacemaker of the heart because it initiates the electrical impulses that cause contraction.
Correct Answer
True
The SA node generates the electrical impulses that set the rhythm for the heart's contractions.
Question 15
Red blood cells are responsible for transporting oxygen and carbon dioxide throughout the body.
Correct Answer
True
Hemoglobin within red blood cells efficiently binds to and transports oxygen to tissues and carbon dioxide from tissues.
Question 16
The primary function of the large intestine is the chemical digestion of carbohydrates, proteins, and fats.
Correct Answer
False
The primary functions of the large intestine are water absorption, electrolyte balance, and the formation and elimination of feces. Most chemical digestion occurs in the small intestine.
Question 17
The diaphragm contracts and moves superiorly during inhalation, increasing the volume of the thoracic cavity.
Correct Answer
False
The diaphragm contracts and moves inferiorly (flattens) during inhalation, which increases the vertical dimension and thus the total volume of the thoracic cavity.
Question 18
The kidneys play a crucial role in regulating blood pressure, electrolyte balance, and red blood cell production.
Correct Answer
True
The kidneys contribute to blood pressure regulation via the renin-angiotensin system, maintain electrolyte homeostasis, and produce erythropoietin for red blood cell synthesis.
Question 19
Insulin is a hormone produced by the adrenal glands that lowers blood glucose levels.
Correct Answer
False
Insulin is produced by the beta cells of the pancreatic islets (of Langerhans) in the pancreas, not the adrenal glands.
Question 20
The epidermis is the outermost layer of the skin and is composed primarily of connective tissue.
Correct Answer
False
The epidermis is the outermost layer of the skin and is composed primarily of stratified squamous epithelial tissue, not connective tissue.
Question 21
The lymphatic system's functions include fluid balance, fat absorption, and immune defense.
Correct Answer
True
The lymphatic system collects interstitial fluid, absorbs dietary fats in the small intestine, and houses immune cells for pathogen defense.