John accidentally steps on a sea urchin while wading in the surf at the beach (ouch!). The sea urchin spine penetrates all the way through the dermis on the sole of his foot. Through how many layers of John's epidermis did the sea urchin spine penetrate?

Question

BlackTom AI · Accepted Answer

To determine how many layers of John's epidermis the sea urchin spine penetrated, we must first understand the structure of the epidermis. The epidermis is the outermost layer of the skin and consists of five distinct layers in thick skin, such as the sole of the foot, which is where John was injured. These layers, from the outermost to the innermost, are: 
1. Stratum corneum
2. Stratum lucidum
3. Stratum granulosum
4. Stratum spinosum
5. Stratum basale

When the sea urchin spine penetrated all the way through the dermis, it necessarily passed through all the layers of the epidermis. The dermis is the layer beneath the epidermis, so for the spine to reach the dermis, it must have traversed the entire epidermal layer. Therefore, the correct answer is '5', as the spine penetrated through all five layers of the epidermis.

Comparatively, the other options ('3', '2', '4') are incorrect because they suggest that the spine did not penetrate all the way through the epidermis. If the spine only penetrated 3 or 2 layers, it would not have reached the dermis, as it would still be within the epidermal layers. Option '4' suggests that one layer of the epidermis was not penetrated, which is inconsistent with the fact that the dermis was reached. Therefore, the only scientifically accurate choice is '5', confirming that all layers of the epidermis were penetrated.

John accidentally steps on a sea urchin while wading in the surf at the beach (ouch!). The sea urchin spine penetrates all the way through the dermis on the sole of his foot. Through how many layers of John's epidermis did the sea urchin spine penetrate?单项选择题

类似问题

Which one of the following is the deepest layer of the epidermis?

You stepped on a nail. List the sequential strata of the epidermis that the nail penetrated through to reach the dermis.

Nails are hard derivatives formed from the stratum __________ of the epidermis.

Which of the below are traits associated with the stratum corneum?

This layer of the epidermis consists of up to 30 layers of dead cells

3. The speaker seems most disappointed about:

2. A typical flying car costs about Answer Question 2[input] times more than a regular car.

Listen to this mini-lecture about flying cars, and answer the following questions. Questions 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Car batteries would need to provide Answer Question 1[input] times more energy for a flying car.

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单