Question 1

A patient is experiencing muscle weakness and fatigue. Blood tests reveal an imbalance in sodium and potassium ions across their cell membranes. Which cellular structure is primarily responsible for maintaining this ion gradient, and what is the main mechanism it uses?

Accepted Answer

The sodium-potassium pump, using active transport ($$\mathrm{3Na^+}$$ out/$$\mathrm{2K^+} in $$per ATP hydrolyzed)

Question 2

During a lab, you observe a tissue sample under a microscope and note that it consists of multiple layers of flat cells. Which type of tissue are you most likely observing, and what is its primary function?

Accepted Answer

Stratified squamous epithelium; protection against abrasion

Question 3

A patient with a genetic disorder cannot produce collagen properly. Which tissue type will be most affected, and what is a likely symptom?

Accepted Answer

Connective tissue; weak and fragile skin

Question 4

Which of the following best describes the function of the sarcoplasmic reticulum in skeletal muscle contraction?

Accepted Answer

It stores and releases $$\mathrm{Ca$$^{2+}$$}$$ ions to trigger muscle contraction

Question 5

A person suffers a deep cut that damages both the epidermis and the dermis. Which of the following processes will be most important for healing the wound?

Accepted Answer

Inflammation followed by fibroblast activity and collagen deposition

Question 6

A patient is diagnosed with osteoporosis, a condition characterized by decreased bone density. Which cells are most likely overactive in this patient, and what is their function?

Accepted Answer

Osteoclasts; bone resorption ($$\mathrm{Ca$$^{2+}$$}$$ release)

Question 7

Which of the following best explains why red blood cells placed in a hypotonic solution will swell and possibly burst?

Accepted Answer

Water moves into the cell by osmosis due to a lower solute concentration outside

Question 8

A patient is unable to produce sufficient insulin, resulting in high blood glucose levels. Which organ is primarily responsible for insulin production, and what is the main effect of insulin on body cells?

Accepted Answer

Pancreas; increases glucose uptake by cells

Question 9

During exercise, the body increases oxygen delivery to muscles. Which physiological changes contribute to this increased delivery?

Accepted Answer

Increased heart rate and vasodilation of skeletal muscle arterioles

Question 10

A patient presents with symptoms of hypothyroidism, including fatigue and weight gain. Which hormone is likely deficient, and what is its primary effect on metabolism?

Accepted Answer

Thyroxine ($$T_4$$); increases basal metabolic rate

Question 11

A person inhales a foreign object that becomes lodged in the right primary bronchus. Which anatomical feature explains why this is more likely to occur on the right side?

Accepted Answer

The right primary bronchus is wider, shorter, and more vertical than the left

Question 12

A patient is experiencing numbness and tingling in their fingers after a neck injury. Which part of the nervous system is most likely affected?

Accepted Answer

Cervical spinal nerves (peripheral nervous system)

Question 13

Which of the following best describes the role of antidiuretic hormone (ADH) in the urinary system?

Accepted Answer

ADH increases water reabsorption in the kidneys, reducing urine volume

Question 14

A patient with a blocked lymphatic vessel in the leg develops swelling (edema). What is the most direct cause of this swelling?

Accepted Answer

Accumulation of interstitial fluid due to impaired lymphatic drainage

Question 15

Which of the following best explains the process of synaptic transmission at a chemical synapse?

Accepted Answer

Neurotransmitters are released from the presynaptic neuron and bind to receptors on the postsynaptic membrane

Question 16

A patient is unable to digest fats properly due to a lack of bile. Which organ is most likely malfunctioning, and what is the primary function of bile in digestion?

Accepted Answer

Liver; emulsifies fats to increase surface area for lipase action

Question 17

A person is exposed to a cold environment and begins to shiver. Which type of muscle is responsible for shivering, and what is the physiological purpose?

Accepted Answer

Skeletal muscle; generates heat through rapid contractions

Question 18

A patient with chronic kidney disease has elevated blood urea nitrogen (BUN) levels. What does this indicate about kidney function?

Accepted Answer

The kidneys are failing to adequately filter nitrogenous wastes from the blood

Question 19

A patient is found to have a blood pH of 7.1. Which of the following best describes this condition, and what is a likely physiological consequence?

Accepted Answer

Acidosis; decreased enzyme activity and CNS depression

Question 20

A person is running a marathon and begins to sweat profusely. Which two organ systems are primarily involved in maintaining homeostasis in this scenario, and what is their main contribution?

Accepted Answer

Integumentary and cardiovascular systems; regulate body temperature and distribute heat

Biology 108: Essentials of Human Anatomy and Physiology – Course Structure and Key Topics

Guida di studio - Domande di pratica

Study guide - Flashcard