A female patient has unexplained severe hypernatremia (plasma Na+ = 167 mmol/L) and complains of frequent urination and large urine volumes. A urine specimen reveals that the Na+ concentration is 15mmol/L (very low) and the osmolarity is 155 mOsm/L (very low). Laboratory tests reveal: plasma renin activity = 3 ng angiotensin I/ml/hr (normal = 1.0), plasma antidiuretic hormone (ADH) = 30 pg/ml (normal = 3 pg/ml), and plasma aldosterone = 20 ng/dL (normal = 6 ng/dL). Which of the following is the most likely reason for her hypernatremia?

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#Question id: 12228

#Unit 10. Ecological Principles

Which of the following examples best describes an ecological community?

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#Question id: 13223

#Unit 6. System Physiology – Plant

At the endodermis, which pathway is blocked by the Casparian strip

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#Question id: 10431

#Unit 6. System Physiology – Plant

The signal transduction pathways that lead to physiological or developmental responses, these responses fall into two general categories;

a) Ion fluxes, which cause relatively rapid turgor responses

b) the possible chain of events constituting the signal transduction pathways that bring about these effects

c) Altered gene expression, which typically results in longer-term responses

d) Gene expression altered shows short-term response

Which of the following combinations from above given general categories is true?

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#Question id: 12206

#Unit 7. System Physiology – Animal

Neonates that are kept in 100% oxygen incubators for several days become blind when they are removed from the incubator, a condition referred to as retrolental fibroplasia. What is the explanation for the loss of sight?

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#Question id: 28834

#Unit 2. Cellular Organization

All microtubules are nucleated from structures known as____