Anatomy and Physiology Flashcards

Which of the following is NOT a digestive system function?

Answer: Performing gas exchange

Performing gas exchange (the intake of oxygen and release of carbon dioxide) is the primary function of the respiratory system, specifically the lungs. The digestive system is responsible for the mechanical and chemical breakdown of food, absorption of nutrients into the bloodstream, and elimination of unabsorbed waste, but not for gas exchange.

What is the best way to define homeostasis?

Answer: a mechanism through which the body maintains a steady internal environment in the face of changes in internal and external circumstances

Homeostasis is the fundamental biological process by which living organisms actively maintain a stable internal environment, such as body temperature, pH, and fluid balance, despite external changes. This definition accurately describes the body's crucial ability to regulate its internal conditions to ensure proper physiological functioning.

Which anatomical directional phrase refers to a bodily component that is positioned in front of the body?

Answer: anterior

In anatomical directional terms, 'anterior' refers to the front, or toward the front, of the body or a body part. 'Posterior' refers to the back, 'superior' refers to above, and 'lateral' refers to away from the midline. Therefore, 'anterior' correctly describes a component positioned in front of the body.

What is the body's biggest organ?

Answer: skin

The skin is the largest organ of the human body, both in terms of surface area and weight. It forms a protective barrier against the environment, regulates body temperature, and performs various sensory and metabolic functions. While the lungs, stomach, and brain are vital organs, they are not as large as the skin.

What's the connection between sarcomeres, myofibrils, and muscle cells?

Answer: Muscle cells include myofibrils, which are composed of sarcomeres.

Muscle cells, also known as muscle fibers, are the basic units of muscle tissue. Within these cells are numerous rod-like structures called myofibrils, which are responsible for muscle contraction. Myofibrils, in turn, are composed of repeating functional units called sarcomeres, which are the smallest contractile units of a muscle.

Which of the following is the most abundant component of whole blood?

Answer: Plasma

Plasma is the liquid matrix of blood, making up approximately 55% of its total volume. It is primarily composed of water (about 92%) but also contains dissolved proteins, hormones, nutrients, electrolytes, and waste products. The cellular components like red blood cells, white blood cells, and platelets are suspended within this plasma.

What type of tissue supports and structures the organs?

Answer: Connective

Connective tissue is one of the four basic tissue types in the body, characterized by its diverse roles. It provides structural support, binds tissues and organs together, protects organs, stores fat, and transports substances. Examples include bone, cartilage, blood, and adipose tissue, all contributing to the body's framework and organ integrity.

What is the name of the tube that links the larynx to the bronchi?

Answer: Trachea

The trachea, commonly known as the windpipe, is a cartilaginous tube that serves as the main airway to the lungs. It extends from the larynx (voice box) down into the chest cavity, where it branches into two main bronchi. This structure ensures a clear passage for air to travel to and from the lungs.

What is the purpose of the extensor muscles?

Answer: Increase the joint angle

Extensor muscles are a type of skeletal muscle that, upon contraction, increase the angle at a joint. This action results in the straightening of a limb or body part. For instance, the triceps brachii muscle is an extensor that straightens the elbow joint, moving the forearm away from the upper arm.

What is the hormone that assists estrogen in stimulating the formation of the endometrium?

Answer: progesterone

Progesterone is a key steroid hormone primarily produced by the corpus luteum after ovulation. It works in conjunction with estrogen to prepare the uterine lining (endometrium) for potential implantation of a fertilized egg. Progesterone stimulates the thickening and vascularization of the endometrium, making it receptive for pregnancy.

How many types of basic tissues does a human have?

Answer: 4

The human body is organized into four fundamental types of tissues, each with specialized structures and functions. These are epithelial tissue (for covering and lining), connective tissue (for support and binding), muscle tissue (for movement), and nervous tissue (for communication and control). These basic tissues combine to form organs and organ systems.

Which of the following organ systems is responsible for creating movement via contraction?

Answer: Muscular

The muscular system is specifically designed for generating movement through the contraction of muscle fibers. It includes skeletal muscles (for voluntary movement), smooth muscles (for involuntary movements in internal organs), and cardiac muscle (for pumping blood). This system enables locomotion, maintains posture, and facilitates the movement of substances within the body.

Which of the following is the most accurate definition of the term circulation?

Answer: The cardiovascular system transports oxygen and other nutrients to the tissues

Circulation refers to the continuous movement of blood throughout the body, facilitated by the cardiovascular system. Its primary role is to transport essential substances like oxygen, nutrients, and hormones to all body tissues. Simultaneously, it carries metabolic waste products, such as carbon dioxide, away from the tissues for excretion, maintaining cellular health and homeostasis.

Which of the following words refers to being near to the body's trunk?

Answer: Proximal

In anatomical terminology, 'proximal' describes a position that is closer to the point of origin or attachment of a body part to the trunk. For example, the shoulder is proximal to the elbow, and the elbow is proximal to the wrist. This term is used to indicate relative closeness along a limb or structure.

What is meant by the word optic?

Answer: The eye or vision

The word 'optic' is derived from the Greek word 'optikos,' meaning 'of or for sight.' It is consistently used in medical and anatomical contexts to refer to the eye or the sense of vision. Examples include the optic nerve, which transmits visual information, and optics, the scientific study of light and vision.

What is called by the release of prolactin during breastfeeding?

Answer: Positive feedback

The release of prolactin during breastfeeding is a classic example of a positive feedback loop. When an infant suckles, sensory nerves in the nipple send signals to the hypothalamus, which stimulates the anterior pituitary to release prolactin. Prolactin then promotes milk production, and increased suckling leads to even more prolactin release, amplifying the response until the stimulus is removed.