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sineoko [7]
3 years ago
7

a cell is viewed under a microscope and is found to have two nuclear envelopes and spindles that appear to be breaking apart. wh

ich phrase of mitosis is the cell most likely in?
Biology
2 answers:
scoundrel [369]3 years ago
8 0
Telophase sounds like the correct answer...
Jet001 [13]3 years ago
8 0
The end of anaphase and the beginning of telophase, since the cell has not fully divided into two, and the spindle fibers are still semi-present.
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Voltage across the cell membrane is determined by the concentration of which 2 types of charged particles?
lisabon 2012 [21]

The answer is; Sodium (Na+) and Potassium (K+) Ions


These cations are pumped out of the cell by Na+-K+ transmembrane protein pumps leaving the inside of the cell electronegative in relation to the extracellular matrix. This membrane potential is significant especially for neurons. Depolarization of the membrane enables transmissions of an impulse along the neurons.


8 0
3 years ago
How can energy from the motion of the crank on a hand-powerd flashlight produce heat?
Alecsey [184]

Answer:

When you manually crank the flashlight, a coil of wire inside the generator converts the mechanical energy into electrical energy. This allows an electrical current to flow through the flashlight, thus lighting the bulb of the flashlight.

8 0
3 years ago
Read 2 more answers
A blood bank refused to accept blood from a potential donor who had just had his teeth cleaned by a dental hygienist. Why did th
Zinaida [17]

Answer:

High amounts of fluoride

Explanation:

Teeth cleaning agents can contaminate one's blood with fluoride, something that it is only healthy to accumulate a small amount of.

7 0
2 years ago
A main difference between fungi and plants is what?.
egoroff_w [7]

Answer:

Fungi have chitin as a component of their cell walls rather than cellulose, which is one of the primary differences between plants and fungi. Chitin and cellulose are both made up of polysaccharide chains. Another difference between plants and fungi is that plants contain chlorophyll whereas fungi do not.

3 0
2 years ago
Some of the nerve endings in the skin are sensitive to changes in temperature. They are part of a negative feedback mechanism re
Gemiola [76]

Answer:

Answer is option A (receptor).

These nerve endings represent a receptor in the negative feedback mechanism.

Explanation:

Homeostasis in the human body is the tendency of the body to maintain its internal environment suitable for normal and optimal functioning by adjusting the changes occurring in internal variables such as body temperature, blood pressure, etc using feedback mechanisms. The two feedback mechanisms involved in homeostasis are positive feedback (the output of the system stimulates the system to increase the output further) and negative feedback mechanisms (the output of the system stimulates the system to decrease the output).

The various components in the feedback loop include;

stimulus - an initiation event that causes changes in a variable.

variable - a physiological factor that is kept at a normal range.

receptors - monitor the variable, detect changes in the variable value and report to control center.

control center - it compares the variable value to the normal range and if any deviation is found, the effectors are activated.

effectors - return the value to the normal range by making adjustments in the same direction (positive feedback) or opposite direction (negative feedback) of the stimulus.

In the body’s thermoregulation mechanism, a negative feedback loop is used in which the variable is body temperature. The nerve endings in the skin that are sensitive to changes in temperature are called heat-sensitive thermoreceptors. They detect changes in body temperature and produce nerve impulses that signal the hypothalamus in the brain. The hypothalamus is the control center that compares the body temperature with the normal range and activates and controls different effectors such as muscles, blood vessels, adrenal glands, sweat glands, etc. These effectors controlled by the hypothalamus perform certain physiological activities that can return the body temperature to normal range.

When body temperature drops, the hypothalamus activates and control the effectors such as blood vessels to constrict in order to decrease the flow of heat to the skin, muscles to shiver in order to increase the production of heat, adrenal glands to secrete hormones (norepinephrine and epinephrine) in order to increase metabolic rates and heat production. All these effects cause the body temperature to increase and return to normal.

When body temperature rises, the hypothalamus activates and controls the effectors such as blood vessels to dilate in order to increase the flow of heat to the skin, sweat glands to release sweat, which on evaporation cools the skin. All these effects cause the body temperature to decrease and return to normal.

8 0
3 years ago
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