Q: Which equation correctly represents the sliding filament theory of muscle contraction?

$$ \text{Actin} + \text{Myosin} \rightarrow \text{Cross-bridge formation} $$

Q: Which equation represents the ATP hydrolysis reaction during muscle contraction?

$$ \text{ATP} + \text{H}_2\text{O} \rightarrow \text{ADP} + \text{P}_i + \text{Energy} $$

Question 1

Which of the following best describes a synovial joint?

Accepted Answer

A joint where bones are separated by a fluid-filled cavity and allow free movement.

Question 2

Which of the following is NOT a function of synovial fluid?

Accepted Answer

Strengthening the joint capsule.

Question 3

A patient presents with limited movement in the knee joint due to inflammation. Which type of joint is affected, and what is the most likely consequence?

Accepted Answer

Synovial joint; decreased range of motion.

Question 4

Which equation correctly represents the sliding filament theory of muscle contraction?

Accepted Answer

$$ 	ext{Actin} + 	ext{Myosin} ightarrow 	ext{Cross-bridge formation} $$

Question 5

Which muscle type is involuntary and striated?

Accepted Answer

Cardiac muscle

Question 6

During a biceps curl, which muscle acts as the agonist?

Accepted Answer

Biceps brachii

Question 7

Which neurotransmitter is released at the neuromuscular junction to initiate muscle contraction?

Accepted Answer

Acetylcholine

Question 8

A patient is unable to extend their leg at the knee. Which muscle group is most likely impaired?

Accepted Answer

Quadriceps femoris group

Question 9

Which of the following best describes the role of calcium ions in muscle contraction?

Accepted Answer

Calcium ions bind to troponin, causing tropomyosin to move and expose binding sites on actin.

Question 10

Which of the following is a structural difference between cardiac and skeletal muscle?

Accepted Answer

Cardiac muscle cells are branched and connected by intercalated discs, while skeletal muscle cells are long and cylindrical.

Question 11

Which equation represents the ATP hydrolysis reaction during muscle contraction?

Accepted Answer

$$ 	ext{ATP} + 	ext{H}_2	ext{O} ightarrow 	ext{ADP} + 	ext{P}_i + 	ext{Energy} $$

Question 12

Which of the following best explains why smooth muscle can sustain contractions for longer periods than skeletal muscle?

Accepted Answer

Smooth muscle uses less ATP and contracts more slowly.

Question 13

A soccer player tears their anterior cruciate ligament (ACL). Which type of joint is affected and what is the primary function of the ACL?

Accepted Answer

Synovial joint; stabilizes the knee during movement.

Question 14

Which of the following muscles is part of the hamstring group?

Accepted Answer

Biceps femoris

Question 15

Which of the following best describes the role of the antagonist muscle during movement?

Accepted Answer

It relaxes to allow the agonist to contract.

Question 16

Which of the following is a function of the sarcoplasmic reticulum in muscle cells?

Accepted Answer

Storing and releasing calcium ions.

Question 17

A patient is diagnosed with myasthenia gravis, a disease affecting the neuromuscular junction. Which process is most directly impaired?

Accepted Answer

Binding of acetylcholine to receptors on the muscle cell membrane.

Question 18

Which equation represents the relationship between force, cross-sectional area, and muscle tension?

Accepted Answer

$$ F = \sigma 	imes A $$

Question 19

Which of the following best describes the difference between isotonic and isometric muscle contractions?

Accepted Answer

Isotonic contractions change muscle length, while isometric contractions maintain muscle length.

Joints and Muscular System: Study Guide for Anatomy & Physiology

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