Essay On The 2d-4d Ratio

The distance from the elbow to the tip of the hand is a quarter of the height of the man

Oxygen debt in the muscles is reached when oxygen levels are much lower than required during strenuous physical activity, causing lactate fermentation to occur in the cells leading to muscle fatigue. The results found in the experiment were the number of squeezes in the first trial for the dominant and non-dominant hands were significantly higher than the remaining ones. The results also showed as the trials continued, the number of muscle contractions decreased steadily which supported the hypothesis. However, there were some increased numbers for the dominant hand from trial 4 to 5 and trial 9 to 10. The non-dominant hand expressed similar unexpected results from trial 6 to 7 and trial 9 and 10. The reasons for these results might be due to the finger muscles being worked at the high intensity for a long period of time causing the muscles to consume higher amounts of oxygen thus producing more ATP production. This would cause the muscles to create more contractions towards the end of the trials. The unexpected results could also be caused by experimental errors such as faulty clothespins. The springs connecting the two ends of the clothespin was tight causing the number of contractions as the trials progressed having a more significant decrease. This is because the amount of energy required to open and close the clothespin would be higher, causing the lactate threshold to occur quicker. Due to this, the number of squeezes would decrease drastically as the trials progressed, in contrast to if the springs were normal. This would change the results by the difference between the trials not being evident therefore, not demonstrating the effects of muscle fatigue. Another factor that altered this experiment was the participant’s condition, Palmar Hyperhidrosis –excessive sweating on the palms – which

In addition to testing both males and females, three different age groups including 16-18 year olds, 21-23 year olds and 47-49 year olds will be have their reaction times assessed. Incorporating a range of individuals from teenagers to middle aged people will allow inferences to be made regarding the effect that age has on reaction time. Across the experiments, two other aspects will be varied including using dominant or non-dominant hands

The hand is a very important extremity attached to the human body and is used in everyday life. Humans use it doing almost everything. The major systems the body uses to be able to move the hands are the skeletal, muscular and nerves systems. The skeletal system of the hand involves the bones, such as, eight carpal bones, five metacarpal and fourteen finger bones (Istitute for Quality & Efficiency in Health Care, 2013). All connected by joints and ligaments. The muscles include two parts, the thenar eminence and the hypothenar eminence (Istitute for Quality & Efficiency in Health Care, 2013). The thenar eminence moves the base of the thumb, also lets the thumb touch the four fingers; the hypothenar eminence allows the little finger to bend

This lab had 2 exercises. Exercise 9.1 involved observing pictures of 60 F2 offspring and recording the phenotypes for 6 different traits. Exercise 9.2 required us to perform the “chi-square test” to determine whether the data we collected matches the standard Mendelian ratio.

Abstract: In this lab, we investigated the reason as to why our fingers prune up when we go swimming or anything that has to with keeping our hands in water for a while. Six cut pairs of dialysis tubing (12 cm) were placed in water for five minutes so that it would form. After it was done forming, we filled it with three different types of NaCl concentration solutions,(1%,10%, and 50%). We placed the six different dialysis tubing filled with the solutions and placed it into the 400 mL beakers with either the 1%, 10%, or 50% for forty minutes.

The respiratory system and circulatory system are both critical to the life of a mammal. The respiratory and circulatory systems depend on each other greatly. An organism needs both systems to be functioning in order to sustain life. Oxygen needs to be exchanged throughout the body, and the respiratory system and circulatory system are the modes of transportation for the oxygen. The respiratory system establishes the breathing of an animal by the transfer of oxygen, which in return allows the circulatory system to work. According to Barilleaux (2014), the gap between respiratory tissues and aerobic tissues was bridged by the circulatory system.

There were two types of calipers used in the experiment. the sliding calipers were used to measure the orbital height in millimeters, whereas the spreading caliper was used to measure the cranial height by measuring the top of the cranial to the foramen magnum in millimeters, the cranial length measured from the glabella to the back of the parietal in millimeters, and width of the widest part of the cranial in millimeters. The spreading caliper did not contain measurements in millimeters, therefore, a measuring tape in centimeters was used and converted in millimeters. Following, the data for Average Age at First Reproduction (years), Maximum Lifespan (years), and Average EQ were calculated for Humans, Neanderthals (Asia and Europe), Homo erectus, Homo habilis, Australopithecus, Apes (5 species), Haplorhines (28 species), and Strepsirhine (25

of the hand, as well as between the fingers, which increased rapidly in size and became

In this thumb wrestling tournament experiment, data was recorded for how long your thumb was, the circumference of your thumb, the length of your hand, and the width of your hand all measured in centimeters. The person with the longest thumb was DJ, the people with the largest thumb circumferences were Deli and Grant with a tie, the person with the longest hand was Trey Griinke, and the person witht he largest hand width was Collin. The averages were 6.57 centimeters for thumb length, 6.35 centimeters for thumb circumference, 17.67 centimeters for hand length, and 8.46 centimers for hand width. DJ, with a hand width of 10 centimeters won the thumb wrestling tournament against Marlee, whose hand width was 8.5

Research by Cabo (2012) states that sex an incontrovertible component of the biological profile. Unlike in the remaining elements of the biological profile, determining the sex is limited to two options: female or male. The hormonal and visual differences which make living women and men distinct also create physiological differences between their skeletons. This sexual dimorphism is most apparent in the pelvic bones and the skull making these bones the most

Biologists believed that facial symmetry should be attractive because it may signal mate quality. Rhodes, Proffit, Grady and Sumich (1998) manipulated the symmetry to figure out the effect on attractiveness. 4 versions of a picture were created. One was perfectly symmetric, the others were a highly symmetric version, normal level of symmetry and a low symmetric version.64 subjects rated these faces. The results clearly stated that perfect symmetry was significantly more attractive and low symmetry faces were unattractive, more over the males found the perfect symmetric faces more appealing as potential life partners, so facial symmetry does play a role in mate selection. In the second experiment the authors compared the attractiveness of faces at three symmetry levels. These were normal, high and perfect. The subjects were shown two versions of the same face at different

The overall purpose of the lab is to have the students practice designing an experiment, gathering data, and then analyzing that data to form a conclusion using the scientific method. It also served to understand key terms such as hypothesis, dependent variable, and independent variable. The specific objective of this lab is to determine whether certain human body parts experience allometric or isometric growth. Allometric growth defines when certain parts of an organism grow at unequal rates in comparison to its whole, while isometric growth is when all parts of an organism grow at the same rate in comparison to the entire organism. The specific purpose of the lab is to determine whether or not specific human body parts experience allometric or isometric growth by comparing the ratios of height to two specific body parts, in the students’ case the right hand length and head circumference, in students and newborns. The students formulated the tentative answer that if a team of four compared their height to right hand length ratio, as well as, their height to head circumference ratio, to those of a newborn’s, then the students will discover that the right hand and head experience allometric growth in humans.

O’Connor Finger and Tweezers dexterity was developed by Jonson O’Connor of General Electric Company in 1920s. Research in the past has demonstrated in the existence of a number of manual dexterities. This test measures Finger Dexterity which involves the ability to-coordinate finger movements in performing fine manipulations. Finger dexterity tests generally require grasping, releasing or manipulation of small objects in which the finger tips is primarily used. In the tweezerss dexterity tests the individual holds a pair of tweezerss in his preferred hand and performs manipulation of small pins.

our everyday life this day. It’s being used in our home to high tech industries.