Anatomy and Physiology Quiz
Questions: 16 · 10 minutes
1. A person suddenly loses a moderate amount of blood. Which immediate response best helps maintain blood pressure?
Decreased heart rate and peripheral vasodilation
Increased heart rate and peripheral vasoconstriction
Increased urine production and reduced thirst
Reduced breathing rate and relaxed arterioles
2. During dehydration, antidiuretic hormone helps conserve body water primarily by causing which change?
Increased urine volume through lower duct permeability
Greater glucose filtration at the glomerulus
Reduced sodium reabsorption throughout the nephron
Greater water reabsorption in the kidney collecting ducts
3. Blood glucose rises after a carbohydrate-rich meal. Which cells respond by releasing insulin?
Pancreatic beta cells
Pancreatic alpha cells
Thyroid follicular cells
Adrenal medulla cells
4. Following activation by a matching antigen, which immune cells specialize in secreting large amounts of antibodies?
Cytotoxic T cells
Neutrophils
Natural killer cells
Plasma cells
5. In which part of the nephron does blood filtration begin?
Loop of Henle
Glomerulus
Collecting duct
Distal convoluted tubule
6. A meal containing fat enters the small intestine. Which organ stores and concentrates the bile released to support fat digestion?
Gallbladder
Liver
Spleen
Pancreas
7. Someone touches a hot pan and withdraws a hand before consciously registering the pain. Where is the rapid withdrawal response primarily integrated?
Spinal cord
Cerebellar cortex
Hypothalamus
Medulla oblongata
8. An injury selectively damages a spinal nerve's dorsal root. Which function would be most directly disrupted?
Motor signals leaving the spinal cord
Contraction at the neuromuscular junction
Hormone release from the pituitary gland
Sensory signals entering the spinal cord
9. A person lifts a cup by flexing the forearm at the elbow. Which muscle is acting as a primary flexor in this movement?
Triceps brachii
Deltoid
Biceps brachii
Latissimus dorsi
10. Which hormonal event most directly triggers ovulation during a typical menstrual cycle?
A sharp decrease in follicle-stimulating hormone
A sustained increase in progesterone
A surge in luteinizing hormone
A decline in gonadotropin-releasing hormone
11. If carbon dioxide accumulates in the blood and lowers its pH, which respiratory response helps restore acid-base balance?
Slower breathing to retain more oxygen
Shallower breathing to conserve bicarbonate
Faster, deeper breathing to remove more carbon dioxide
Temporary closure of the upper airway
12. Which respiratory structure provides most of the surface where oxygen and carbon dioxide move between air and blood?
Alveoli
Bronchi
Pleural cavity
Trachea
13. After passing through the lungs, oxygen-rich blood returns to the heart. Which chamber pumps it into systemic circulation?
Right atrium
Right ventricle
Left ventricle
Left atrium
14. Which type of bone cell breaks down bone matrix during normal remodeling?
Osteoblast
Osteoclast
Osteocyte
Chondrocyte
15. A very shallow scrape damages only the epidermis and does not bleed. Which feature best explains the lack of bleeding?
The epidermis receives blood only during inflammation
The epidermis is composed entirely of connective tissue
Blood vessels in the epidermis close permanently after injury
The epidermis contains no blood vessels
16. Why does myelin usually allow an axon to conduct impulses faster?
It causes neurotransmitters to travel through the axon
It enables impulses to jump between nodes of Ranvier
It keeps every sodium channel continuously open
It converts electrical signals directly into hormones