A
A student is exercising in a warm gym. As their body temperature rises, they begin sweating to cool down and return their temperature toward normal. What process is maintaining the body?
Homeostasis
Which structure of the eye controls the size of the pupil and regulates how much light enters the eye?
Iris
A person has difficulty moving their arm after an injury damages the connection between a muscle and a bone. Which structure is most likely injured?
Tendon
What ion enters a neuron during depolarization to make the inside of the cell more positive?
Sodium (Na⁺)
A person can hear sounds but cannot distinguish different pitches properly. Which sensory structure is responsible for detecting sound frequencies?
Cochlea.
An elderly patient experiences frequent fractures because their bones have become weak. Testing reveals that bone breakdown is occurring faster than new bone formation. Which type of bone cell is contributing to this excessive breakdown?
Osteoclasts
Which bone connects the sternum to the scapula and helps form the shoulder framework?
Clavicle
When you run, your heart beats faster, your breathing increases, and your leg muscles contract. Which three body systems are working together?
Cardiovascular, respiratory, and muscular systems!
When a person enters a dark room, the photoreceptors responsible for detecting dim light become more important for vision. Which photoreceptors are activated?
Rods
A person experiences difficulty detecting the smell of freshly prepared food despite having normal taste-bud function. Which sensory system is impaired?
Olfactory system (smell).
A patient experiences muscle weakness because calcium cannot bind to the regulatory protein in their skeletal muscle fibers. As a result, the binding sites on actin remain covered, preventing normal muscle contraction. Which protein is malfunctioning?
Troponin
Which type of joint allows movement in multiple directions, including rotation, flexion, and extension, as seen at the shoulder?
Ball-and-socket
A patient suffers a spinal cord injury that interrupts communication between the brain and structures below the injury. They lose sensation and voluntary movement in parts of their body. Which two major divisions of the nervous system are involved in normal communication between the brain and the body?
CNS and PNS
A patient has damage to the receptors responsible for detecting changes in blood pressure. The control center and effectors are functioning normally, but the body cannot properly detect the initial change. Which component of the homeostatic control system is damaged?
Receptor
A patient suffers an injury to the muscle on the back of their upper arm. They can still bend their elbow, but they struggle to straighten it when pushing a heavy object away. Which muscle has been damaged?
Triceps brachii
A patient has a neurological disorder that damages the myelin surrounding their axons. Their nerve impulses travel more slowly because electrical signals cannot efficiently jump between the gaps along the axon. What type of nerve conduction is disrupted?
Saltatory conduction
Which region of the brainstem contains vital centers involved in regulating breathing, heart rate, and blood pressure?
Medulla oblongata
A person is running outside on a hot day. Their body temperature begins to rise, so the brain activates sweat glands to cool the body. Which brain structure detects and coordinates the response to help maintain homeostasis?
Hypothalamus.
A patient has damage to muscle tissue found in the walls of their intestines. As a result, food is no longer pushed efficiently through the digestive tract. Which type of muscle is affected?
Smooth muscle.
A soccer player suddenly loses the ability to lift the front part of their foot while walking. Their toes drag along the ground, making them lift their knee unusually high to avoid tripping. Which muscle is most likely weakened?
Tibialis anterior
A patient has damage to the hypothalamus. They cannot properly regulate body temperature. Even when their body temperature rises, they fail to activate sweating and other cooling responses. Which homeostatic control component is damaged?
Control center
During a muscle tissue practical, a student examines a skeletal muscle slide and identifies specialized membrane tunnels that extend deep into the muscle fiber. These structures carry electrical signals from the cell surface toward the sarcoplasmic reticulum, helping trigger calcium release. What are these structures called?
T-tubules
A person narrowly avoids a car accident. Immediately afterward, their heart rate and breathing increase, their pupils dilate, and blood flow is redirected toward their skeletal muscles. At the same time, digestive activity decreases. Which division of the autonomic nervous system is responsible for coordinating these changes?
Sympathetic nervous system.
A biopsy reveals that a patient's tissue contains cells arranged in tightly packed layers with very little extracellular material. The tissue is responsible for forming a protective barrier, but it also allows certain substances to pass through. Which tissue type is present?
Epithelial tissue
A patient fractures a bone that forms the lateral side of the lower leg. Although the bone is fractured, the larger bone beside it continues to bear most of the body's weight. Which bone is injured?
Fibula