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Counter current flow - Respiration
Each filament has an upper and a lower row of flat lamellae. The lamellae of successive filaments are in close contact. Gas exchange takes place in these lamellae as water flows between them in one direction and blood within them in the other direction. This we call a counter current flow. This type of flow has an important consequence. It permits the fish gills to have the highest possible oxygen levels.
Figure: Counter current flow
Explain disease typhoid Typhoid is often called enteric fever because the infection or bacteria is found in the intestines and attaches itself to the epithelium of the intes
parts involving in circulatory system
TRANQUILLIZER S - These are the drugs that reduce tension and anxiety, bring calmness without inducing sleep. (i) Phenothiazines - These are anti psychotic drugs.
Transparency - Aquatic Habitats Transparency affects the extent of light penetration. It is indirectly related to turbidity. Suspended particulate matters such as clay, silt a
Q How do amoebae, paramecia and trichomonas respectively move? Amoebae move by amoeboid movements small invaginations and projections of their plasma membrane (pseudopods) that
What are the main negative ions found in living beings? The major anions found in living beings are the chlorine anion (Cl-), the phosphate anion (PO4--), the bicarbonate anion
Human Impact on Carbon Cycle Human activities have greatly influenced the carbon cycle. The discharge of CO 2 , into the atmosphere is steadily increasing owing to burning of
State the term- Hue Hue is the dominant spectral colour (rainbow) and is related to the wavelength of light. In Munsell system there are five principal hues; red (R), yellow (
WHAT ARE TRACHEOLES
What are the events that mark the beginning and the end of the third interphase period? What happens in the cell in this period? The third interphase period is the G2. It star
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