Select the typical effects of aging on the immune system.Multiple select question.Decreased function of natural killer cellsInvolution of the thymusDecreased responses to vaccinesDecline in antibody responses

Effects of ageing on the immune response include:Group of answer choicesan increasingly exaggerated response of B cells to newly encountered antigensan increase in macrophage numbers resulting in increased autoimmune disordershypertrophy of the thymus resulting in declining numbers of T cellsincreased vulnerability to cancer due to a decline in immune surveillance

Which of the following correctly describes the effect of aging on the lymphatic system?Multiple ChoiceAs an individual ages, lipid absorption from the small intestine by lacteals decreases.Aging has very little effect on the lymphatic system’s ability to remove fluid from tissues.Aging decreases the filtering process of the spleen.All of the choices are correct.

The idea of "healthy aging" is one that has been extensively studied by scientists and researchers who investigate physiological reasons why some people experience less severe mental and physical declines as they age, as compared with others. A team of biologists led by Frances Evans, Daniela Alí-Ruiz, and Natalia Rego studied the protein CD300f, an immune receptor that has been linked to aging. The researchers tracked the aging of mice with and without CD300f over 30 months. The mice without CD300f showed reduced lifespan and increased frailty and were less likely to be able to complete cognitive puzzles than mice with CD300f, suggesting that -------Which choice most logically completes the text?the presence of CD300f contributes to healthy aging by impeding mental and physical decline.eliminatethe presence of CD300f is a risk factor for age-related health problems.eliminate"healthy" aging is not limited only to humanity, but can also be found in organisms like mice as well.eliminatethe presence of CD300f had no impact on the rate of mouse aging.

Which of the following statements about the immune system is/are true?Question 15Select one or more:a.Moderate exercise decreases numbers of circulating neutrophils, monocytes and natural killer cells.b.The immune system uses chemokines to attract cells such as neutrophils.c.Immune cells can communicate with each other by binding to receptors on each other’s surfaces.d.The immune system uses cytokines for communication over short distances.e.Adaptive immunity is slower-acting than innate immunity.

Select all that applyIndicate four changes that take place in the respiratory system of the elderly.Multiple select question.Number of ciliated epithelial cells increases.Coughing reflexes slow down.Macrophages are less efficient.Pleural fluid becomes thinner.Mucus becomes thicker.Number of alveoli decreases.