The epiglottis is the structure that prevents food and liquids from entering the trachea. It is a flap of tissue that blocks the entrance to the trachea when you swallow. The larynx, glottis, and vestibular folds are part of the throat but do not prevent food and liquid from entering the trachea.
The structure that prevents food and liquids from entering the trachea is the epiglottis. The epiglottis is a flap of tissue that sits at the base of the tongue. When you swallow, this flap blocks the entrance to the trachea, directing food and liquids down the esophagus and into the stomach, rather than into your lungs. The larynx, glottis, and vestibular folds are also part of the throat anatomy, but they do not have the primary function of preventing food and liquid from entering the trachea.
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The mechanical digestion in the stomach involves the contractions of muscle smoothly. Thus, the correct answer is C.
The process of converting food into nutrients to use it as energy and for development is called as digestion. The digestion takes place mechanically and chemically.
In the chemical process of digestion, food is broken down with the help of enzymes whereas in the mechanical process of digestion food is broken down with the help of chewing from teeth or tearing.
Therefore, option C is correct as this breakdown through teeth involves contractions and relaxation of muscles.
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Mechanical digestion in the stomach involves the physical breakdown of food through smooth muscle contractions, which churns and mixes the food, preparing it for further chemical digestion.
Mechanical digestion in the stomach involves the breaking down of food into smaller bits using physical force. This process includes the smooth muscle contractions of the stomach to churn the food. This mechanical churning of food in the stomach serves to further break it apart and expose more of its surface area to digestive juices, creating an acidic soup called chyme.
These contractions isolate small sections of the stomach, moving the contents back and forth while continuously subdividing, breaking up, and mixing the contents. By moving food back and forth in the stomach, mechanical digestion mixes food with digestive juices and facilitates the further process of chemical digestion.
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B. releases negative ions that create an electrical gradient that all sperm swim toward.
C. releases chemotaxic signals to attract sperm to its location.
D. propels itself toward seminal fluid by calcium-dependent kinesis.
Answer:
C. releases chemotaxic signals to attract sperm to its location.
Explanation:
An oocyte is female gametocyte which is involved in the reproduction. It is produced in ovary during the female gametogenesis. After ovulation, during luteal phase, egg is available to be fertilized by the sperm.
Sperm are attracted toward the eggs by the process of chemotaxis which is by following the gradient of chemical secreted by egg.
Thus, the oocytes in the female body control not only type of sperm they want ot attract, but also time at which they attract them.
Answer:
Option B, Xylem --> phloem --> endodermis --> stele --> epidermis --> cortex --> cambium ///
Explanation:
The start of water transportation via roots takes place through the Xylem as these are the specialized cell in roots to intake water from the ground. These cells are arranged in the form of layer and filters the water before transporting. After the filtration in Xylem, water then passes to phloem (which are also part of conducting system of plants and runs parallel to the xylem). After the phloem, water then goes to the central part of the root which is known as stele and then it reaches the epidermis. From epidermis , absorbed water then goes to the cortex of other tissues and organ and finally it reaches the cambium.
Hence, option B is correct
Answer:
No, you would not go blind, even though the composition of emotional tears are different.
Answer:
Simply no, But when humans cry in response to stress, their tears contain a number of stress hormones and other chemicals. Researchers believe that crying could reduce the levels of these chemicals in the body, which could, in turn, reduce stress.