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2 years ago

An oocyte released from a human ovary enters the oviduct as a result of

Biology

1 answer:

malfutka [58]2 years ago

3 0

Answer:

An oocyte released from human ovary enters the oviduct as a result of wavelike motion of beating cilia present inside the oviduct.

Explanation:

The ovum is released from the grafiaan follicle during the ovulatory phase of Menstrual cycle.
It is caused by the increasing turgidity and contraction of smooth muscle fibres around the Graafian follicle.

During ovulation the ovum is at secondary oocyte stage.
Ovum released from the Graafian follicle is trapped by the fimbriae of the ampulla of fallopian tube.
Then the ovum moves into the oviduct towards the uterus by peristalsis and ciliary action of the walls of oviduct which is made up of ciliated columnar epithelium.

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3. From problem 2, suppose another boy, Boy C pulls the heavy cabinet with 5 N

kykrilka [37]

Answer and Explanation:

As you can see the boys are pulling in the same direction. This means that we have an example of an unbalanced force, also called the resulting force, since the forces are not canceling out. This whole situation will have a result which is to create an unbalanced net force to move the object or keep it in repayment and that is what we will discover.

First, let's find out what force the two boys exerted. This is very simple, we only need to add the force exerted by the two. 5N + 5N = 10N

The cabinet will be able to move if the force exerted by the two boys (10N) manages to overcome the resistance and the force exerted by the cabinet itself. If they manage to overcome the resistance of the cabinet, the cabinet will move towards the force applied by the boys.

5 0

2 years ago

6. A scientist measures the circumference of acorns in a population of oak trees

melisa1 [442]

Answer:

6. 2 cm

8. Greater than 2 cm and less than 2 cm

Explanation:

Complete Question

6. A scientist measures the circumference of acorns in a population of oak trees and discovers that the most common circumference is 2 cm. What would you expect the most common circumference(s) to be after 10 generations of stabilizing selection?

-2 cm

-Greater than 2 cm or less than 2 cm

-Greater than 2 cm and less than 2 cm

-Can't tell from the information given

8. Refer to question 6, but this time answer what you would expect after 10

generations of directional selection.

-2 cm

-Greater than 2 cm or less than 2 cm

-Greater than 2 cm and less than 2 cm

-Can't tell from the information given

Solution -

6. In an stabilizing selection, the average trait of a given population is favored over extreme values. Hence, it can be said that one specific trait is over presented in a given population. For example – uniform human birth weight, number of eggs a bird lay etc.

Here in this case if most common circumference is 2 cm , then the tree population will try to have this trait as a stabilizing trait.

Thus, option A is correct

8. In a directional selection, the genetic variation decreases as per the environmental change. And hence the average trait will not be selected. Instead traits either higher or lower the average values will be preferred.

Thus, option C is correct

3 0

2 years ago

A 45-year-old woman named Christine is measured as having the following skinfold thicknesses on the right side of her body: Tric

TEA [102]

Answer:

The skinfold method, the measurement of subcutaneous fat folds, is the most widely adopted field method for the assessment of body fat, especially in children.

It is based on the principle that fat is of a known density and by “summing” measurements of subcutaneous fat thickness across the body, total and regional fat can be estimated.

Skinfold thickness measurements are typically used to rank individuals in terms of relative total “fatness”, or to assess subcutaneous fat at various regions of the body.

Population specific equations are used to derive estimates of percent body fat.

In infancy, it might be the sole tool available for assessing body composition longitudinally as other methods may not be feasible, or may only be suitable for use at body sizes e.g. PEA POD, can only measure infants up to 10kg.

3 0

2 years ago

In response to seasonal changes in temperature, many organisms must alter the composition of their plasma membranes to maintain

aleksandrvk [35]

Answer:

C. a decrease in phospholipid fatty acid side chain length and a decrease in side chain saturation

Explanation:

Temperature is a factor that has a huge impact on cell membrane structure, more precisely its fluidity. So, for example, if temperature increases, the cell membrane becomes more fluid because the fatty acid tails of the phospholipids become less rigid.

5 0

2 years ago

Some tools have various levels of graduations. For example, a ruler may have graduations for both millimeters and centimeters. W

Eduardwww [97]

Answer:

Centimeters

Explanation:

5 0

2 years ago