1.
Cholesterol is known as LDL. What does LDL stand for?
Correct Answer
B. Low-Density Lipoproteins
Explanation
LDL stands for Low-Density Lipoproteins. Lipoproteins are molecules that transport cholesterol and other fats through the bloodstream. LDL is often referred to as "bad cholesterol" because high levels of LDL can lead to the buildup of plaque in the arteries, increasing the risk of heart disease.
2.
Hardening of arteries is known as what?
Correct Answer
A. Atherlosclerosis
Explanation
Atherosclerosis is the hardening and narrowing of the arteries due to the buildup of plaque, consisting of cholesterol, fat, and other substances, on the artery walls. This condition can lead to reduced blood flow and potential blockages, increasing the risk of heart disease, stroke, and other cardiovascular problems. Atherosclerosis is a common condition associated with aging and unhealthy lifestyle choices such as a poor diet, lack of exercise, smoking, and high blood pressure.
3.
The top number on a blood pressure reading indicates what?
Correct Answer
D. Systolic pressure
Explanation
The top number on a blood pressure reading indicates the systolic pressure. Systolic pressure is the highest level of pressure in the arteries when the heart is contracting and pumping blood. It represents the force exerted on the arterial walls during each heartbeat.
4.
Breathing properly requires the presence of?
Correct Answer
C. Surfactant
Explanation
Breathing properly requires the presence of surfactant. Surfactant is a substance that reduces surface tension in the alveoli of the lungs, allowing them to expand and contract easily during the breathing process. It also helps to prevent the collapse of the alveoli, ensuring efficient gas exchange. Without surfactant, the alveoli would be less flexible and more prone to collapse, leading to difficulties in breathing. Potassium and plasma are not directly involved in the process of breathing, and therefore are not necessary for it.
5.
Which of the following is not a function of the kidney?
Correct Answer
C. Transport
Explanation
The kidney performs several important functions, including filtration, reabsorption, and secretion. Filtration refers to the process of removing waste products and excess water from the blood to form urine. Reabsorption involves the reabsorption of essential substances like water, glucose, and electrolytes back into the bloodstream. Secretion is the process of actively transporting certain substances, such as drugs and toxins, from the blood into the urine. However, transport is a broad term that can encompass both reabsorption and secretion, so it is not a distinct function of the kidney. Therefore, transport is not a function of the kidney.
6.
What is the function unit of the kidney?
Correct Answer
D. NepHron
Explanation
The function unit of the kidney is the nephron. Nephrons are responsible for filtering blood and producing urine. Each kidney contains millions of nephrons, which consist of a glomerulus and a tubule. The glomerulus filters waste products and excess water from the blood, while the tubule reabsorbs necessary nutrients and water back into the bloodstream, and excretes waste products as urine. Therefore, the nephron plays a crucial role in maintaining the body's fluid balance and removing waste products from the blood.
7.
The 1st American to win a Nobel Prize was ____ for measuring the sound of light.
Correct Answer
B. Albert Michelson
Explanation
Albert Michelson is the correct answer because he was the first American to win a Nobel Prize. He received the Nobel Prize in Physics in 1907 for his precision optical instruments and the spectroscopic and metrological investigations carried out with their aid. The question also mentions that he won the prize for measuring the sound of light, which is a reference to his famous experiment called the Michelson-Morley experiment, which aimed to detect the existence of the luminiferous ether.
8.
What body part connects the stomach to the mouth?
Correct Answer
D. EsopHagus
Explanation
The correct answer is the esophagus. The esophagus is a muscular tube that connects the stomach to the mouth. It plays a crucial role in the process of swallowing, as it transports food and liquids from the mouth to the stomach through a series of muscular contractions called peristalsis. The trachea, spinal column, and hepatic duct are not involved in the connection between the stomach and the mouth.
9.
Which of the following is considered a component of lipids?
Correct Answer
B. Fatty acids
Explanation
Fatty acids are considered a component of lipids. Lipids are a group of organic compounds that are insoluble in water but soluble in organic solvents. They play various roles in the body, such as providing energy, acting as structural components of cell membranes, and serving as signaling molecules. Fatty acids are the building blocks of lipids and are composed of a long hydrocarbon chain with a carboxyl group at one end. They can be saturated or unsaturated, depending on the presence or absence of double bonds in the hydrocarbon chain.
10.
Down's syndrome effects which chromosome?
Correct Answer
C. 21
Explanation
Down's syndrome is a genetic disorder caused by the presence of an extra copy of chromosome 21. This additional genetic material disrupts the normal development and causes the characteristic physical and cognitive impairments associated with the syndrome. Therefore, the correct answer is 21.
11.
Blood enters the lungs from which chamber of the heart?
Correct Answer
C. Right ventricle
Explanation
The blood enters the lungs from the right ventricle of the heart. The right ventricle pumps deoxygenated blood from the heart to the lungs through the pulmonary artery. In the lungs, the blood picks up oxygen and releases carbon dioxide, and then returns to the heart through the pulmonary veins to the left atrium. From there, it is pumped to the rest of the body by the left ventricle.
12.
Excessive consumption of alcohol is most likely to damage which organ of the body over a long period of time?
Correct Answer
B. Liver
Explanation
Excessive consumption of alcohol over a long period of time is most likely to damage the liver. The liver is responsible for metabolizing alcohol, and excessive alcohol consumption can lead to inflammation, scarring, and liver disease such as alcoholic hepatitis, cirrhosis, and liver cancer. The liver plays a crucial role in detoxifying the body, producing bile for digestion, and storing essential nutrients. Therefore, alcohol abuse can have severe consequences on liver function and overall health.
13.
Which of the following is not considered a type of radiation ray?
Correct Answer
D. Infrared
Explanation
Infrared radiation is not considered a type of radiation ray because it has longer wavelengths and lower energy compared to other types of radiation rays such as gamma, beta, and alpha rays. Infrared radiation is commonly associated with heat and is used in various applications such as remote sensing, thermal imaging, and communication. However, it is not classified as a type of radiation ray in the context of ionizing radiation, which includes gamma, beta, and alpha rays that have higher energy and can cause ionization of atoms or molecules.
14.
A molecule of hemoglobin can hold how many molecules of oxygen in the blood for transport?
Correct Answer
B. 4
Explanation
A molecule of hemoglobin can hold four molecules of oxygen in the blood for transport. Hemoglobin is a protein found in red blood cells that binds to oxygen in the lungs and carries it to the body's tissues. Each hemoglobin molecule contains four iron atoms, each of which can bind to one molecule of oxygen. Therefore, a single hemoglobin molecule can transport up to four molecules of oxygen.
15.
Which of the following best describes the biomechanics of breathing?
Correct Answer
A. Pump handle motion
Explanation
The correct answer is "pump handle motion". This term is used to describe the movement of the ribs during breathing. During inspiration, the ribs move upwards and outwards, similar to the motion of a pump handle being lifted. This motion increases the volume of the thoracic cavity, allowing air to enter the lungs.
16.
Animals that eat meat almost exclusively are known as:
Correct Answer
B. Carnivores
Explanation
Carnivores are animals that primarily consume meat. They have adaptations such as sharp teeth and claws to help them catch and kill their prey. Unlike herbivores, which mainly eat plants, carnivores rely on a diet consisting mainly or exclusively of other animals. Arthropods, on the other hand, are a large group of invertebrate animals that include insects, spiders, and crustaceans, but not all arthropods are carnivores. Prolific organisms refer to organisms that reproduce in large numbers, but this term is not related to the dietary habits of animals.
17.
The physical expressions of a gene are known as an organism's:
Correct Answer
B. Genotype
Explanation
The physical expressions of a gene are known as an organism's phenotype. The genotype, on the other hand, refers to the genetic makeup or the specific combination of alleles that an organism possesses. While the genotype influences the phenotype, it is the phenotype that represents the observable characteristics or traits of an organism. Therefore, the correct answer is phenotype.
18.
Neurons connect together at a ______.
Correct Answer
D. Synapse
Explanation
Neurons connect together at a synapse, which is the junction between two neurons. At the synapse, electrical signals are transmitted from one neuron to another through the release and reception of chemical messengers called neurotransmitters. This process allows for communication and coordination between neurons, enabling the transmission of information throughout the nervous system.
19.
Which of the following is another word for the kneecap in the human body?
Correct Answer
D. Patella
Explanation
The correct answer is Patella. The patella is a small, flat, triangular bone located in front of the knee joint. It is commonly known as the kneecap and plays a crucial role in the movement and stability of the knee. The other options mentioned are incorrect. Pisiform is a small bone in the wrist, meniscus refers to the cartilage in the knee joint, and popliteal bursa is a fluid-filled sac located behind the knee.
20.
Which of the following describes the shoulder joint
Correct Answer
A. Ball and socket
Explanation
The shoulder joint is described as a ball and socket joint. This type of joint allows for a wide range of movement in multiple directions. The ball-shaped head of the upper arm bone fits into the cup-shaped socket of the shoulder blade, allowing for rotation, flexion, extension, abduction, and adduction of the arm. This design provides stability and mobility to the shoulder joint, making it one of the most flexible joints in the body.
21.
The organ of Corti is found in what area of the body?
Correct Answer
C. Ear
Explanation
The organ of Corti is found in the ear. It is a structure located in the cochlea, which is part of the inner ear. The organ of Corti is responsible for converting sound vibrations into electrical signals that can be interpreted by the brain. It contains hair cells that are essential for hearing.
22.
The condition of rickets is associated with a deficiency in which vitamin?
Correct Answer
C. D
Explanation
Rickets is a condition that is associated with a deficiency in vitamin D. Vitamin D is essential for the body to absorb calcium and phosphorus, which are necessary for strong and healthy bones. A deficiency in vitamin D can lead to weakened and soft bones, causing symptoms such as bone pain, muscle weakness, and skeletal deformities. Therefore, option d, vitamin D, is the correct answer.