Q: What are responsible for removing excess h+ ions from the blood? Read this paragraph and choose the correct option from the provided answers: The kidneys are responsible for removing excess H+ ions from the blood. If the kidneys fail, what would happen to blood pH and to hemoglobin affinity for oxygen? Factors That Affect Oxygen Binding The oxygen-carrying capacity of hemoglobin determines how much oxygen is carried in the blood. In addition to P O , 2 other environmental factors and diseases can affect oxygen carrying capacity and delivery. Carbon dioxide levels, blood pH, and body temperature affect oxygen-carrying capacity (Figure 39.20). When carbon + dioxide is in the blood, it reacts with water to form bicarbonate (HCO 3 ) and hydrogen ions (H ). As the level of carbon dioxide in the blood increases, more H+ is produced and the pH decreases. This increase in carbon dioxide and subsequent decrease in pH reduce the affinity of hemoglobin for oxygen. The oxygen dissociates from the Hb molecule, shifting the oxygen dissociation curve to the right. Therefore, more oxygen is needed to reach the same hemoglobin saturation level as when the pH was higher. A similar shift in the curve also results from an increase in body temperature. Increased temperature, such as from increased activity of skeletal muscle, causes the affinity of hemoglobin for oxygen to be reduced. Diseases like sickle cell anemia and thalassemia decrease the blood's ability to deliver oxygen to tissues and its oxygencarrying capacity. In sickle cell anemia, the shape of the red blood cell is crescent-shaped, elongated, and stiffened, reducing its ability to deliver oxygen (Figure 39.21). In this form, red blood cells cannot pass through the capillaries. This is painful when it occurs. Thalassemia is a rare genetic disease caused by a defect in either the alpha or the beta subunit of Hb. Patients with thalassemia produce a high number of red blood cells, but these cells have lower-than-normal levels of hemoglobin. Therefore, the oxygen-carrying capacity is diminished. Choices: - liver nodes - intestinal walls - stomach chambers - kidneys A:
kidneys

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Q: When different types of tissues work together to perform a unique function, what do they form? Read this paragraph and choose the correct option from the provided answers: Plant Organ Systems In plants, just as in animals, similar cells working together form a tissue. When different types of tissues work together to perform a unique function, they form an organ; organs working together form organ systems. Vascular plants have two distinct organ systems: a shoot system, and a root system. The shoot system consists of two portions: the vegetative (nonreproductive) parts of the plant, such as the leaves and the stems, and the reproductive parts of the plant, which include flowers and fruits. The shoot system generally grows above ground, where it absorbs the light needed for photosynthesis. The root system, which supports the plants and absorbs water and minerals, is usually underground. Figure 30.2 shows the organ systems of a typical plant. Choices: - organs - Brian - produce - organ A:
(Answer)
organ

Ques: Q: Where do cells come from? Read this paragraph and choose the correct option from the provided answers: No matter what the cell, all cells come from preexisting cells through the process of cell division. This is one of the core concepts of the Cell Theory. The cell may be the simplest bacterium or a complex muscle, bone, or blood cell. The cell may comprise the whole organism, or be just one cell of trillions. But whatever type of cell it is, it comes from a preexisting cell. And the new cell is genetically identical to its parent cell - that is, it has exactly the same DNA. Choices: - sexual reproduction - mutations - nuclear fission - preexisting cells A:
Ans: preexisting cells

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Q: What is the largest organ of the human body? Read this paragraph and choose the correct option from the provided answers: You couldn't survive without your skin. It has many important functions. In several ways, it helps maintain homeostasis. The main function of the skin is controlling what enters and leaves the body. It prevents the loss of too much water from the body. It also prevents bacteria and other microorganisms from entering the body. Melanin in the epidermis absorbs ultraviolet light. This prevents the light from reaching and damaging the dermis. Choices: - your lungs - your brain - your blood - your skin A:
(A).
your skin

Ques:Q: Which metalloids are found in the nitrogen group? Read this paragraph and choose the correct option from the provided answers: Group 15 is called the nitrogen group. The metalloids in this group are arsenic and antimony. Group 15 also contains two nonmetals and one metal. Choices: - polonium and antimony - selenium and antimony - sulfur and polonium - arsenic and antimony A:

Ans:arsenic and antimony

Question: Q: What's it called when there's a sudden flow of mud? Read this paragraph and choose the correct option from the provided answers: A mudflow is the sudden flow of mud down a slope because of gravity. Mudflows occur where the soil is mostly clay. Like landslides, mudflows usually occur when the soil is wet. Wet clay forms very slippery mud that slides easily. Mudflows follow river channels, washing out bridges, trees, and homes that are in their path. Choices: - avalanche - sediment - dirt bath - mudflow A:
Answer:
mudflow