Free Anatomy and Physiology Questions and Answers — Questions and Answers
Question 1: Which of the following is an example of swatting a mosquito?
- Use of the somatic nervous system (Correct answer)
- An unconscious reflex
- Use of the autonomic nervous system
- A sensory neuron reflex
Correct answer: Use of the somatic nervous system
Swatting a mosquito is a conscious, voluntary action that requires deliberate muscle movement. The somatic nervous system is responsible for controlling voluntary movements of skeletal muscles. It transmits signals from the central nervous system to the muscles, enabling intentional actions like swatting.
Question 2: We refer to this as __ when an output from a process prompts the creation of a substance that produced the initial output.
- nervous system deactivation
- Negative feedback
- Positive feedback (Correct answer)
- Fight or Flight
- Hungry feedback
Correct answer: Positive feedback
Positive feedback occurs when the output of a system amplifies or enhances the original stimulus, leading to an even greater response. In this described scenario, the output (creation of a substance) further prompts the production of that substance, creating a reinforcing cycle that increases the initial output. This is characteristic of positive feedback loops.
Question 3: Why is the presence of interneurons required?
- To send messages to the central nervous system
- To associate sensory signals with objects
- To move our muscles
- To assist afferent and efferent neurons in their jobs to send messages. (Correct answer)
Correct answer: To assist afferent and efferent neurons in their jobs to send messages.
Interneurons are found exclusively within the central nervous system and serve as crucial intermediaries. They connect afferent (sensory) neurons, which bring information to the CNS, with efferent (motor) neurons, which carry commands away from the CNS. Their role is to integrate sensory input and formulate appropriate motor responses, effectively assisting both types of neurons.
Question 4: The following statement is FALSE.
- There are two accessory nerves, one on either side of your body
- CN XI helps your head and neck move around
- The accessory nerve helps your eyes move around (Correct answer)
- The accessory nerves help us shrug
Correct answer: The accessory nerve helps your eyes move around
The accessory nerve (Cranial Nerve XI) primarily controls the sternocleidomastoid and trapezius muscles, which are involved in head and neck movements and shrugging the shoulders. Eye movements are controlled by other cranial nerves, specifically the oculomotor, trochlear, and abducens nerves, not the accessory nerve. Therefore, the statement that the accessory nerve helps your eyes move around is false.
Question 5: Despite not serving as a structural link like bone or cartilage, why is blood still regarded as a connective tissue?
- Blood serves the extracellular connector of bone and cartilage
- All of your body's critical organs are connected by blood
- Blood is a structural connector, much like bone or cartilage
- Blood is made up of cells suspended in extracellular fluid (Correct answer)
Correct answer: Blood is made up of cells suspended in extracellular fluid
Connective tissues are characterized by having cells dispersed within an abundant extracellular matrix. While blood is fluid and doesn't provide structural support like bone, it fits this definition because its cells (red blood cells, white blood cells, platelets) are suspended in a liquid extracellular matrix called plasma. This composition allows blood to connect and transport substances throughout the body.
Question 6: The ___ of a neuron is the area that receives the impulse.
- Cell body
- Axon
- Dendrite (Correct answer)
- Nerve
Correct answer: Dendrite
Dendrites are the branched, tree-like extensions of a neuron that receive chemical signals (neurotransmitters) from other neurons. They act as the primary input region of the neuron, transmitting these impulses towards the cell body. This makes dendrites the specific area responsible for receiving incoming signals.
Question 7: High tensile strength can be found in:
- Blood
- Loose connective tissue
- Bone
- Fibrous connective tissue (Correct answer)
Correct answer: Fibrous connective tissue
Fibrous connective tissue, also known as dense connective tissue, is rich in densely packed collagen fibers. These collagen fibers are arranged in parallel bundles, providing exceptional tensile strength and resistance to pulling forces. This characteristic is crucial for structures like tendons and ligaments, which connect muscles to bones and bones to bones, respectively.
Question 8: Which of the following is NOT an epithelial tissue function?
- To secrete mucus
- To absorb nutrients
- To serve as a protective barrier against invading organisms
- To transmit the sensation of pain to the brain and spinal cord (Correct answer)
Correct answer: To transmit the sensation of pain to the brain and spinal cord
Epithelial tissues primarily serve functions such as protection (e.g., skin), secretion (e.g., glands), absorption (e.g., lining of intestines), and filtration. The transmission of sensations like pain to the brain and spinal cord is a specialized function of nervous tissue, specifically sensory neurons, not epithelial tissue.
Question 9: The site of substrate binding is referred to as the
- Enzyme-Substrate complex
- Active Site (Correct answer)
- Catalyst
- Lactose
- Induced Fit
Correct answer: Active Site
The active site is a specific region on an enzyme where substrate molecules bind. This site possesses a unique three-dimensional shape and chemical properties that allow it to precisely recognize and interact with its specific substrate(s), facilitating the catalytic reaction. It is where the enzyme-substrate complex is formed.
Question 10: Before he begins his tennis competition preparation, Justin wants to consume foods that are high in energy. What cuisine will provide him with the greatest energy per pound out of the following?
- Carbohydrates
- Protein
- Sugar
- Fat (Correct answer)
Correct answer: Fat
Fats (lipids) are the most energy-dense macronutrient, providing approximately 9 calories per gram, which is more than double the energy provided by carbohydrates or proteins (about 4 calories per gram). Therefore, to obtain the greatest energy per pound, Justin should consume foods high in fat.
Question 11: Which group of functional categories can be consistently found in sugars?
- Amines and alcohols
- Ethers and amines
- Hydroxyl groups (Correct answer)
- Ethers and carboxylic acids
Correct answer: Hydroxyl groups
Sugars, or carbohydrates, are chemically defined as polyhydroxy aldehydes or ketones. This means their molecular structure consistently contains multiple hydroxyl (-OH) functional groups. These hydroxyl groups are responsible for many of the characteristic properties of sugars, including their solubility in water.
Free Anatomy and Physiology Questions and Answers
Which of the following is an example of swatting a mosquito?