<span>To summarize, when we swallow food, the food pushes on the soft palate, sealing off the nasal cavity and preventing food from entering the nose. The food then begins to slide down the esophagus. The swallowing reflex raises the larynx up under the epiglottis as the ball of food pushes down the epiglottis, sealing off the trachea; then the esophageal sphincter relaxes so the food passes through the esophagus. I hope this helps you! :D</span>
Answer:
A, Both cells will replicate their DNA.
Explanation:
During the cell division, cell passes through several phases and divides. Before each phase, the cell has to pass through the checkpoints. At these cell checkpoints, the cell receives the internal and external signals.
When the cell is arrested at G₀ phase, the cell does not divide until it receives a signal to proliferate but when the cell passes the G₁ phase, the cell will divide continuously.
In the given question, if the cells when in their G₀ and G₁ phase receive proliferation signal, the G₀ phase cell will also divide and will replicate it DNA during S phase as G₁ phase cell will do.
Thus, Both the cells will divide their genetic material.
Answer: prophase
Explanation:
Each chromosome becomes condensed (pact together) which makes it more visible to see it
The right answer is d. sugar molecules move outside of the membrane.
The simple diffusion is the diffusion through the plasma membrane (in the direction of the strong concentrations towards the weak concentrations, until equilibrium concentrations on both sides of the membrane). In the case that we have, the most concentrated compartment in glucose (that is inside the cell) will let it escape and go to the extracellular compartments until reaching equal concentrations between the two compartments.
Answer:
E. contraction of the stapedius and tensor tympani muscles.
The acoustic reflex protects the ear from intense sounds by <u>contraction of the stapedius and tensor tympani muscles.</u>
Explanation:
Although there are two middle ear muscles (tensor tympani and stapedius) in humans, only the stapedius muscle contracts in response to sound.
Contraction os stapedius causes a change in the axis of rotation of the stapes footplate, thus increasing the immitance of the middle ear system. This change in conductivity through the middle ear can be measured indirectly as changes in acoustic immitance. This reflex results in decreased sound transmission to trochlea.
Hence the answer is E. contraction of the stapedius and tensor tympani muscles.
