The point at which two bones meet is called a:

• Ligament

• Tendon

• Joint

• Cartilage

Which bone is part of the axial skeleton?

• Humerus

• Femur

• Skull

• Radius

What type of joint is the elbow joint, allowing for flexion and extension?

• Ball-and-socket joint

• Pivot joint

• Hinge joint

• Gliding joint

Which bone is NOT part of the appendicular skeleton?

• Pelvis

• Sternum

• Femur

• Scapula

What is the functional unit of a skeletal muscle that contracts when stimulated by a motor neuron?

• Sarcomere

• Myofibril

• Myosin filament

• Actin filament

Which protein, found in muscles, is responsible for binding with calcium ions and initiating muscle contraction?

• Actin

• Myosin

• Troponin

• Tropomyosin

What is the main function of the muscular system's antagonist muscles?

• Initiate muscle contractions

• Provide support and stability

• Oppose or reverse a particular movement

• Store energy in the form of ATP

What is the term for the junction between a motor neuron and a muscle fiber, where the transmission of nerve impulses triggers muscle contraction?

• Neuromuscular junction

• Synaptic cleft

• Myofibril junction

• Motor unit

In the context of muscle contraction, what is the role of ATP (adenosine triphosphate)?

• Initiating muscle relaxation

• Facilitating the sliding of myofilaments

• Storing oxygen in muscle cells

• Regulating muscle temperature

Tags

NGSS.MS-LS1-7

Which of the following describes the correct sequence of events in the sliding filament mechanism?

• Myosin heads bind to actin → ATP is hydrolyzed → Cross-bridge detachment occurs

• Calcium binds to troponin → Tropomyosin shifts → Myosin binds to actin → Power stroke

• ATP binds to actin → Myosin binds to ATP → Calcium is released from the sarcoplasmic reticulum

• Troponin binds to myosin → Calcium detaches → ATP is used for muscle relaxation